API High Range pH Test Kit for freshwater & saltwater Brightwell Marine 100% aragonite substrate is a

100% aragonite substrate is a good intermediate sand size product

NITRA-ZORB filtration media is scientifically proven to remove aquarium toxins

while de-ionized water measures 0–1 µS

We also recommend the use of foam fractionation or "protein skimmers

API High Range pH Test Kit for freshwater & saltwater Brightwell Marine 100% aragonite substrate is aUse to measure pH changes in marine aquariums, aquariums with African cichlids, and very alkaline tap water. Reads the pH of water within the high range of 7. 4 to 8. 8. 160 tests per kit. Freshwater Saltwater High Range pH Test Instructions: Why Test pH? pH is the measure of acidity of water. A pH reading of 7. 0 is neutral. A pH higher than 7. 0 is alkaline, and a pH lower than 7. 0 is acidic. Certain freshwater fish thrive at a pH above 7. 0. Live