Waterlife 7.2 Buffer creates ideal conditions for most community tropical fish and plants that prefer a neutral pH. Waterlife 7.2 Buffer will increase the pH to 7.2 in low pH aquariums, and decrease pH to 7.2 in high pH aquariums. 7.2 Buffer increases the buffering capacity of the water to stabilise the pH. 7.2 Buffer is a true buffer, i.e. once the correct amount is added, pH 7.2 stability will be achieved. This product will not lower the pH below 7.1 or raise it above 7.3.