What Chemicals are used for the PH control contained by Spas? ...

Maytag washer sour stability?
Answers:    Same as swimming pools, which are chlorine and muriatic acid, or its equivalent. Your nearest Walmart carry all these.
Here's a join that should help
About nouns proof ceiling?
to enjoy a good hose down balance, 5 factor are needed:
pH,total alkalinity,calcium hardness,heat and total dissolved solids. pH is of course the most critical next to
alkalinity and calcium next. The roll is endless on what to use
and can capture very expensive (Chlorine, Bromine, Sanitizers,
Oxidizers, Shock treatments, etc.) I amendment and/or clean
my filter regularly and use "arm & hammer baking soda"
for the pool and spa it keep the water clear and fresh thus abiding the overpriced chemicals, holp this helps.........