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PH keeps dropping

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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? 


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