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I thought keeping your alk around 100 was supposed to help stablize the pH.
always seems to be around 150.
Small doses will not knock down alkalinity over time. It tends to bounce back up if you don't use larger doses.
That's why it's sometimes hard to give water advice- it varies so much from person to person. My Ph tends to creep up over time- not sure why. I'm using dichlor, both to sanitize and as a shock. Once in a while I'll add some MPS. Nothing much else goes in the water. So why the Ph creep?