Welcome to our forum.
For instance, Doc sells Sea Klear non chlorine shock .
Thanks, I just ordered some from him, will try it. I only use it every other week, so it won't affect my PH that much so I'll give it a try.
If I might ask, why are you looking to an alternative to MPS?
Another question for those without 24 hr circ pumps or air BLOWERS. When the spa is not in use, should the air INJECTION be on or off during filter cycles? Does it make any difference? Was thinking that with the air on, the fine bubbles would give suspended particles something to grab onto and improve overall filtration (or is this just a plain dumb idea?)
Last, is it normal for the water to look pretty cloudy with the jets and air on high? Within a minute or two after the pumps turn off and the fine bubbles rise/dissipate the water is very clear.
The air injector tends to have no effect when the pump is on filter cylce - at least in all the spas I've seen.