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I didn't think I needed to add calcium because I had a vinyl liner. Why do they try to get you to buy stuff that you don't need. Is there so advantage to adding the calcium?

So I don't have my kit yet just a basic kit so I figured I would get my water tested at the pool store. Here are my results FC 4.0 Total C 4.0 CC 0.0 PH 7.5 CH 110 TA 50 Cyanuric Acid 10 I was told to get 25 lbs Calcium Chloride, 25 lbs alkalinity increaser, and 12 lbs stabilizer(conditioner)...

First time poster and pool owner! I bought a house with a pool that has not been used for 3 years and has not been covered. I have a D.E. filter that I pulled and cleaned and then added the media and filtered. The first time took about 30 minutes for the psi to go up 8 from the clean state...