High PH and Low Alkalinity?

[PoolDoc]

In water treatment, pH and alkalinity are related but different.

The easiest way to think about it is to consider alkalinity to be a particular water solution's resistance to pH change. If you imagine pH to be the position of a see-saw, then alkalinity measures how stiff the see-saw's pivot is. If the pH 'see-saw' is very hard to move, then the 'alkalinity' is high, and so on.

It gets complicated however, because the principle source of alkalinity in pools is carbon dioxide, as baking soda (sodium bicarbonate or alkalinity increaser) or washing soda (sodium carbonate, soda ash, or pH Up). Having a gas that can leave the pool, but affects the chemistry till it does, makes things confusing.

Lower your pH.

If you still have a problem, come back and we'll explain more. Or read this page, for some further explanation:

lowering-swimming-pool-alkalinity-step-by-step.html