spf8298 Posted April 6, 2021 Report Share Posted April 6, 2021 I have a Calspa 425 gallon spa with an ozonator and I keep experiencing a PH drop weekly. I have a Taylor Test Kit and test weekly and the PH will always settle around 6.9-7.0. I used 'PH up' to bring it in line to 7.2-7.4 but it also raises the TA to the point the water gets cloudy. My TA can range anywhere from 100-170. I use dichlor for sanitizing and i don't think it would cause the PH drop. We only use the dichlor after use, per the recommendation of the place we purchased. We also use the tub about 3-4 times a week. Not everyday. Most peoples experiences on the forum deals with PH rising. Anyone have any suggestions for me to rectify this situation? Shaun Quote Link to comment Share on other sites More sharing options...
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