Mike,
The most common non-chlorine shock is potassium monopersulfate (KMPS). It is best used as a maintenance product once every week or every two weeks as it is much better at oxidizing organics BEFORE chlorine combines with them. It is not very good at breaking down combined chlorine (CC) that has already been formed. It is not cheap.
However, there is probably no need to shock your pool at all. Most outdoor pools exposed to sunlight do not build up combined chlorine while outdoor pools with SWG almost always have zero combined chlorine, so no need to shock them. The SWG superchlorinates a portion of the water that passes through the cell and this seems to keep the combined chlorine near zero.
Do you have a good chlorine test kit (e.g. Taylor K-2006) that measured a combined chlorine amount and is that why you believe you need to shock, or did the pool store just assume you should be shocking regularly? If the latter, they are probably wrong and you shouldn't need to shock.
Richard
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