m7cl

Alrighty, I'll give that a go. One thing confuses me about my situation. If I add chemical to raise alkalinity won't that raise my ph like crazy? My ph is already at the upper end of the recommended range.

I did use a plumbing cleaner when I drained the tub last. I ran seaklear for a half hour with the pump on high while switching through all the jet diverter settings. Actually I even sucked the water out of the plumbing with a shop vac before refilling. I did read that MPS will affect a dpd cc test reading, but I'm wondering how long after treatment it will affect the test. Are you suggesting I add regular ol household bleach that you buy from the laundry detergent isle at the store?

I just replaced the water in my tub and I'm having some super strange chlorine issues. Here is what I've done so far. Day one I test and balance the water (lower ph from 8.0 to 7.6 using sodium bisulfate), then shock with MPS and chlorinate with dichlor. I leave it over night to do its thing and go for a soak the next day. I quickly tested with a test strip for convenience and needed to add 1.5 tsp of dichlor to raise Fc to 4ppm 10-15 minutes before my soak. Water felt great, had a very slight chlorine smell at first tho. two days layer (day 4 after refill) I re test to check Ph, Cl etc. I find that my ph is back up at 8.0, I have 0 Fc and my Cc is 3ppm. So I re treat with sodium bisulfate and get Ph back down to 7.6, I shock with MPS a second time since I had 0 Fc, and added dichlor to 5ppm of Fc. So today (day 5 after re fill), I re test and my numbers are as follows. Something just seems off, new water shouldn't have CC like it seems to have! Im kinda lost here. For the record I am testing with the Taylor K2005 test kit with dpd. Fc 1 CC 3 PH 7.6 Alk 80 CH 100 CYA (not sure, waiting for more reagent from taylor) What am I missing folks?