To successfully prevent algae growth in ponds and aquariums, the water parameters should be regularly tested. Tetra Test AlgaeControl 3in1 is the optimal help to measure the water parameters nitrate and phosphate. This makes it easy to keep control of the most important algae parameters and successfully prevent algae growth in your pond and aquarium. The Tetra Test AlgaeControl 3in1 also measures Carbonate Hardness, because this water parameter is very important for stable water conditions and for preventing a sudden drop in acidity. To use the Tetra Test AlgaeControl 3in1 simply dip them into the water, swirl them in the water for one to two seconds. Just 60 seconds later read off the most important information about the water parameters nitrate, phosphate and carbonate hardness without shaking off excess water. The colour chart can be used to determine whether these are within the safe range or if an increase or a reduction is needed.