Since I also suffer from the increase of ph syndrome , I've taken an interest in this ..I dont have the ph swings that some have reported , but I do need to add muriatic acid maybe every 10 days (varies , I havent kept track)

My pool
ph 7.5 normally
ALK 110
vinyl liner

Thinking of the possible cause/contributors , I wonder how much an effect DE is having behind the scene. I dont know the ph of diatomaceous earth , but since its a "chalk" , wouldnt it be alkaline ? and following that couldnt leaching be a contributor ?

just a thought