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Occasional coughing when jets on in my 450 gallon spa. Im doing 3-step bromine so bromine tabs in floater, use chlorine to shock/oxidize, no ozonator in spa, and I did add a sodium bank at startup. Had some coughing yesterday with jets on and I tested yesterday morning and had bromine at 4...

I’m a new spa and pool owner and a big fan of Poolmath. I’m using 3-step bromine method in my spa and have one question re dosing. In other posts chemgeek shares that to get MPS dosing from poolmath, simply double the dichlor dose amount. One caveat is that it assumes 43% MPS. Most of...