Can you make a case for potassium monopersulfate over the calcium hypoclorite shock my pool store strongly recommends? How often should I shock my lightly used pool (gunite with tri-chlor tablets)?


Monopersulfate has two advantages. First, it is not chlorine. If you have a sufficient level of chlorine but feel a shock treatment is in order (i.e. you have combined chlorine that is not going away) you can use monopersulfate without increasing the chlorine level. If water has some chlorine odor, but chlorine shows acceptable, consider a non-chlorine shock. The second reason monopersulfate is often used is that you can swim as soon as 90 minutes after adding a shock dosage. Therefore, you do not have to wait for the chlorine to drop in order to get back in the water.

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