Reiko89 Posted July 11, 2019 Report Share Posted July 11, 2019 I operate a half dozen commercial hot tubs, and need a cheaper method of cleaning my cartridge filters than the aquasparkle sachets. The filters are usually cleaned upwards of twice a week due to heavy use of our hot tubs, I as wondering if I could use something like Sodium Hydrochlorite (14/15%) to clean the filters? And if so, what ratio of that to water should I be using? Quote Link to comment Share on other sites More sharing options...
Matt16060936 Posted September 15, 2019 Report Share Posted September 15, 2019 I use Leisure Time Filter Clean, and the warning label says "Danger: contains sulferic and hydrochloric acid". So if I were going to buy something in bulk to water-down and clean filters, I'd probably start with muriatic acid from the hardware store. Searching google for "clean spa filter muriatic acid" shows that other people have tried this, but I haven't read into whether or not it's a good idea 😅 Quote Link to comment Share on other sites More sharing options...
mcw53 Posted September 15, 2019 Report Share Posted September 15, 2019 I clean my Hotspring ceramic filters with Trisodium Phosphate. I use 1 cup per 5 gallons of water and let them soak for a couple hours. The Chemistry Store sells TSP in bulk for less than $1.50/lb. https://www.chemistrystore.com/product.cgi?product=17927 Edit: Just noticed the original post is over 2 months old ... oh well, I hope this helps someone. Quote Link to comment Share on other sites More sharing options...
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