San Rafael, CA United states of america Jan 27, 2015 Incorporate bookmark #three Are you presently positive you were not employing sodium persulfate (not monopersulfate)? This is simply not similar to potassium monopersulfate. The concentration is likely for being various so you'll want to dose by different amounts. Sodium persulfate https://pool.net/filterglas-aktivfilter-0-5-1-0-grad-1-pool-filtermaterial.html