Free shipping from €50 (and to Belgium from €100.00)
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Free shipping from €50 (and to Belgium from €100.00)
Many Payment Methods, including iDEAL, PayPal, Apple Pay, Google Pay, Credit Card & Bancontact.
Free shipping from €50 (and to Belgium from €100.00)
Many Payment Methods, including iDEAL, PayPal, Apple Pay, Google Pay, Credit Card & Bancontact.
Free shipping from €50 (and to Belgium from €100.00)
Many Payment Methods, including iDEAL, PayPal, Apple Pay, Google Pay, Credit Card & Bancontact.
Free shipping from €50 (and to Belgium from €100.00)
Many Payment Methods, including iDEAL, PayPal, Apple Pay, Google Pay, Credit Card & Bancontact.
Free shipping from €50 (and to Belgium from €100.00)
Many Payment Methods, including iDEAL, PayPal, Apple Pay, Google Pay, Credit Card & Bancontact.
Free shipping from €50 (and to Belgium from €100.00)
Many Payment Methods, including iDEAL, PayPal, Apple Pay, Google Pay, Credit Card & Bancontact.
Free shipping from €50 (and to Belgium from €100.00)
Many Payment Methods, including iDEAL, PayPal, Apple Pay, Google Pay, Credit Card & Bancontact.
Welcome to MaJa Koi
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Evolution HQ
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Test sets
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€16,69
With the Sera Phosphate Test PO4, you can quickly and easily measure the current phosphate level in aquarium water. Phosphate is produced by fish waste, uneaten food, and natural decomposition processes in the aquarium, among other things. In limited amounts, phosphate can serve as a nutrient for plants, but an excess provides an important nutrient source for unwanted algae.
By regularly checking the PO4 level, you can better monitor water quality and take preventive action against algae growth. According to MaJa Koi, excess phosphate can be removed with suitable phosphate-reducing products, such as variants for freshwater, brackish water, saltwater, or ponds. The contents are sufficient for approximately 60 tests.
Key points
- Measures the phosphate level in aquarium water
- Helps detect elevated PO4 levels early
- Important for preventing unwanted algae growth
- Phosphate can be produced by fish waste and feeding
- Supports better control over water quality
- Suitable for regular aquarium maintenance
- Practical for aquariums with recurring algae problems
- Excess phosphate can be targeted for removal with a suitable phosphate-reducing product
- Contents are sufficient for approximately 60 tests
- Ideal for better management of the biological balance in the aquarium
€12,99
With the Sera Nitrite Test NO2, you can quickly and reliably check the nitrite level in aquarium water. Nitrite is highly toxic to fish and can develop when the biological filtration is not yet working sufficiently or when the biological balance is disrupted. By regularly measuring the NO2 level, you can immediately see whether the water is safe and take timely action.
This test is suitable for both freshwater and saltwater aquariums and is an important tool when setting up a new aquarium, after filter maintenance, or in case of suspicious fish reactions. MaJa Koi states that the test easily and safely determines the nitrite level and that the contents are sufficient for approximately 75 tests. For slightly elevated nitrite levels, bacterial products can provide support; for high nitrite levels, rapid water treatment is required.
Key points
- Measure the nitrite level in aquarium water
- Suitable for freshwater and saltwater aquariums
- Helps to detect toxic NO2 levels in time
- Important for a newly set up aquarium
- Practical after filter maintenance or disruption of the biological balance
- Supports better control over the water quality
- Nitrite can accumulate with insufficient biological filtration
- Simple and safe testing method for regular use
- Contents are sufficient for approximately 75 tests
- In case of elevated nitrite levels, targeted action can be taken with appropriate water treatment
€16,89
With the Sera Ammonium/Ammonia Test NH4/NH3, you can easily check the total concentration of ammonium and ammonia in aquarium water. These substances are produced, among other things, by fish waste, leftover food, and the decomposition of organic material. When biological filtration is insufficient or the aquarium becomes unbalanced, levels can rise quickly.
Especially ammonia NH3 poses a risk to fish. The ratio between ammonium and ammonia is strongly related to the pH level: at higher pH levels, more toxic ammonia can be produced. This test gives you quick insight into current water safety and allows you to take targeted action before fish are harmed.
Key points
- Measures the total concentration of ammonium and ammonia in aquarium water
- Helps detect toxic NH3 levels in time
- Important for newly set up aquariums or a disrupted biological balance
- Ammonia can be harmful and toxic to fish
- The ratio between NH4 and NH3 depends on the pH level
- Practical for high fish stocking, leftover food, or organic load
- Supports better control over the water quality
- Suitable as part of regular aquarium maintenance
- Helps identify biological filtration problems more quickly
- 60x
€8,89
With the Sera gH Test, you can easily measure the total hardness of the aquarium water. Total hardness indicates how many dissolved minerals, such as calcium and magnesium, are present in the water. This value is important for the health of fish, shrimp, and plants, as each species has specific requirements for water hardness.
By regularly checking the gH value, you can better tailor the aquarium water to the natural habitat of your animals. According to MaJa Koi, the test is suitable for approximately 420 °dGH and the package contains 15 ml of test liquid. If the total hardness is too low, mineral supplementation can be used; if the total hardness is too high, mixing with reverse osmosis water can help.
Key points
- Measures the total hardness of aquarium water
- Provides insight into the amount of dissolved minerals
- Important for fish, shrimp, and aquarium plants
- Helps better tailor water parameters to the needs of the animals
- Practical for softwater and hardwater aquariums
- Suitable for regular monitoring of water quality
- If hardness is too low, the mineral balance can be increased
- If hardness is too high, reverse osmosis water can be used to lower it
- Suitable for approximately 420 °dGH
- Contents: 15 ml of test liquid
€8,89
With the Sera kH Test, you can easily measure the carbonate hardness of aquarium water. The KH value plays an important role in the stability of the pH level. When the carbonate hardness is too low, the pH can fluctuate more quickly. If the value is too high, it can be more difficult to create softer water or specific water conditions.
This test is suitable for both freshwater and saltwater aquariums and helps you to accurately monitor the water quality. According to MaJa Koi, the test is suitable for approximately 390 °dKH and the package contains 15 ml of test liquid. If the KH value is too low, the carbonate hardness can be increased; in cases of elevated values, filtration through peat can help in freshwater aquariums.
Key points
- Measures the carbonate hardness of aquarium water
- Suitable for freshwater and saltwater aquariums
- Helps to better monitor pH stability
- Important for fluctuating or unstable water values
- Practical for adjusting the water to fish and plants
- Suitable for regular monitoring of the water quality
- If the KH is too low, the carbonate hardness can be specifically increased
- If the KH is elevated, filtration through peat can be applied in freshwater
- Suitable for approximately 390 °dKH
- Contents: 15 ml of test liquid
€8,89
With the Sera pH Test, you can easily check the acidity of aquarium water. The pH value is one of the most important water parameters in the aquarium, because it directly affects the well-being of fish, plants, and beneficial bacteria. A pH value that is too high, too low, or fluctuating greatly can cause stress to aquarium inhabitants and disrupt the biological balance.
This test is a practical basic for anyone who wants to seriously monitor the water quality. By regularly measuring the pH value, you can detect deviations early and make targeted adjustments where necessary. MaJa Koi places this test within the aquarium test sets category and identifies the pH value as an important parameter for the well-being of aquarium inhabitants.
Important points
- Measures the pH value / acidity of aquarium water
- Important for the well-being of fish, plants, and bacteria
- Helps to detect pH fluctuations in time
- Practical when starting up a new aquarium
- Suitable for regular monitoring of the water quality
- Supports a more stable biological balance
- Ideal as a basic test within aquarium maintenance
- Makes it clear whether water parameters need to be adjusted
- Suitable for aquariums with sensitive fish species
- Helps to better adapt the aquarium water to its inhabitants
€34,69
With the Sera Aqua Test Set, you have a compact and reliable basic set for checking the most important water parameters in your aquarium. Regular testing is essential to identify problems early and keep the aquarium water healthy, stable, and safe for fish, plants, and beneficial bacteria.
This set contains tests for pH level, total hardness, carbonate hardness, and ammonium/ammonia. This allows you to check several crucial parameters that affect the well-being of aquarium inhabitants and the biological balance at once. MaJa Koi describes the set as an indispensable tool for both experienced and advanced aquarium enthusiasts and notes that regular monitoring helps to intervene preventively in problems such as algae, without being directly dependent on chemical products.
Key points
- Complete basic set for testing important aquarium water parameters
- Measures the pH level / acidity of the water
- Measures the total hardness gH
- Measures the carbonate hardness kH for better pH stability
- Measures ammonium/ammonia NH4/NH3
- Helps identify water quality problems early
- Supports a stable and healthy environment for fish and plants
- Practical for regular aquarium maintenance and preventive monitoring
- Suitable for both experienced and advanced aquarium enthusiasts
- Helps with targeted adjustments without unnecessary use of chemical products
€18,39
With the Sera Quick Test 6 in 1, you can quickly and easily check the most important water parameters of your aquarium with just one test strip. This makes the test ideal for a quick routine check or an immediate safety check when you have doubts about the water quality. In no time, you will gain insight into several crucial parameters, allowing you to quickly see whether the aquarium water is balanced.
The test measures pH, kH, gH, NO2, NO3 and chlorine. This allows you to check, among other things, the acidity, hardness, carbonate hardness, nitrite, nitrate and chlorine levels. MaJa Koi lists the Sera Quick Test 6 in 1 in the aquarium test sets category, where the product is offered as a quick testing solution for aquarium water. The official Sera product information confirms that this quick test is intended for the quick and accurate measurement of these six water parameters.
Key points
- Measure six important water parameters with one test strip
- Checks pH, kH, gH, NO2, NO3 and chlorine
- Ideal for quick routine checks of aquarium water
- Practical when in doubt about the current water quality
- Helps to detect abnormal water parameters in a timely manner
- Suitable for beginners and experienced aquarium owners
- Supports a stable environment for fish and plants
- Quick testing method without complicated procedures
- Convenient as an initial indication before potentially testing more accurately with drop tests
- Suitable as a regular part of routine aquarium maintenance
With the Sera Aqua Test Box (+ Cl), you get a comprehensive test kit for thoroughly analyzing aquarium water. This box is designed for experienced and advanced aquarium enthusiasts who want to actively maintain a stable, healthy, and reliable aquatic environment. By testing regularly, you can detect deviating water parameters early and take preventive action before problems such as algae growth, fish stress, or disruption of the biological balance occur.
The test box contains tests for pH, total hardness, carbonate hardness, ammonium/ammonia, nitrite, nitrate, phosphate, iron, and chlorine. This gives you a broad and complete picture of the current water quality. According to MaJa Koi, this comprehensive set helps to professionally analyze and specifically adjust the aquarium water without having to immediately resort to unnecessary chemical products.
Key points
- Complete test kit for comprehensive water analysis
- Measures 9 important aquarium water parameters
- Checks pH, GH, KH, NH4/NH3, NO2, NO3, PO4, Fe, and chlorine
- Helps detect deviations in water quality early
- Supports preventive management of, among other things, algae growth
- Suitable for experienced and advanced aquarium enthusiasts
- Provides broad insight into the biological and chemical balance of the aquarium
- Practical for regular monitoring and professional aquarium maintenance
- Helps take targeted action without unnecessary use of chemical products
- Ideal for aquariums where stable water parameters are crucial
€99,00
With the Sera Aqua Test Box (+ Cu), you have a comprehensive test kit for professionally monitoring aquarium water. Regular water analysis is essential to keep the aquarium stable, healthy, and safe. By regularly measuring the most important water parameters, you can detect deviations early and take targeted action before problems such as algae growth, fish stress, or disruption of the biological balance occur.
This test box contains tests for pH, total hardness, carbonate hardness, ammonium/ammonia, nitrite, nitrate, phosphate, iron, and copper. This provides an in-depth overview of the chemical and biological water quality. The copper test makes this version particularly suitable for aquariums where copper levels are critical, for example with sensitive fish or invertebrates such as shrimp, crayfish, and snails. MaJa Koi states that this set is intended for experienced aquarists who want to closely monitor conditions in the aquarium and take appropriate measures to ensure a healthy environment.
Key points
- Complete test kit for comprehensive water analysis
- Measures 9 important aquarium water parameters
- Checks pH, GH, KH, NH4/NH3, NO2, NO3, PO4, Fe, and copper
- Helps detect deviations in water quality early
- Supports the prevention of, among other things, algae growth
- Provides broad insight into the biological and chemical balance of the aquarium
- Particularly suitable when monitoring copper is important
- Practical for aquariums with sensitive fish or invertebrates
- Suitable for regular monitoring and professional aquarium maintenance
- Helps enable targeted action without unnecessary use of chemicals
€53,99
Digital Water Meter for Aquariums – 4-in-1 Measurement for a Healthy Aquatic Environment
This digital water meter is an essential tool for any aquarium enthusiast who wants to monitor water quality accurately. The meter measures four important parameters in one compact and user-friendly device: pH, conductivity (EC), TDS (total dissolved solids), and water temperature (°C/°F).
Key features:
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4-in-1 measurement: Measure acidity (pH), conductivity (EC), TDS, and temperature with a single device
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Fast and accurate readings: Insert the meter into the aquarium water and receive reliable measurement results within seconds
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Easy to use: Large, clear display and automatic shut-off for energy savings
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Compact and portable: Ideal for use with aquariums, ponds, or hydroponic systems
Includes:
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4 x LR44 batteries (included)
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pH calibration powders for accurate adjustment
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Quick start guide
Technical specifications:
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pH measurement range: approx. 0.00 – 14.00
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EC/TDS measurement range: wide range suitable for fresh and salt water
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Temperature range: °C and °F selectable
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Display: Digital, with backlight
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Power supply: 4 x LR44 batteries (included)
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Automatic shut-off: For energy savings when not in use
Benefits:
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Reliable measurement for optimal living conditions for fish and plants
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Compact design, easy to carry or store
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No separate devices needed for different measurements
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Ideal for both beginner and experienced aquarists
Maintain stable water parameters with the Digital Aquarium Water Meter and provide your fish and plants with the best living environment.
€15,99
Colombo Quick Test 6 in 1 Test Strips Pond – fast and complete water testing for ponds and koi ponds
The Quick Test 7 in 1 Test Strips Pond by Colombo is a practical and reliable solution for quickly checking the water quality in ponds and koi ponds. With these test strips, you can measure seven important water parameters in a short amount of time: pH, nitrite, nitrate, KH, GH, chlorine. This gives you an immediate, comprehensive, and clear overview of the current water conditions.
Quick overview of 6 important water values
By measuring several essential values at the same time, these test strips provide an efficient way to assess overall water quality. This makes it easier to detect deviations early and take timely action when the balance in the water is under pressure. This test set thus helps maintain a healthy biological balance in the pond or koi pond.
Easy to use and read instantly
Using the Colombo Quick Test 7 in 1 Test Strips Pond is easy and time-saving. Dip the strip in the water for a few seconds, compare the color-changed areas with the included color chart, and read the results immediately. This allows you to quickly determine whether the water is suitable for your fish or whether additional measures are needed to improve the water quality.
Helps prevent stress, disease, and algae problems
Regularly checking these seven parameters helps reduce risks such as stress, disease, and algae problems. By recognizing deviations in the water values early, you can carry out more targeted maintenance and prevent problems before they affect the well-being of your fish or the stability of the pond system.
Supports a stable and healthy pond environment
Good water analysis is an important part of responsible pond maintenance. These test strips support an optimal pond environment in which fish can stay healthy and the biological balance is maintained. This makes this test set a valuable tool for both periodic checks and routine maintenance.
Compact and practical for regular use
Thanks to the compact packaging, the test strips are easy to store and always quickly available when you want to perform a check. This makes the set particularly suitable for pond owners who want to monitor the water quality systematically and be able to act quickly when necessary.
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