Hello all - I am New and Confused! I am not even sure I am doing this posting thing right, so forgive me if I am in the wrong place. We just installed a Sentinelle 24 foot 52 inch above ground pool. We have a cartridge filter (and disconnected the Zodiak Vision system b/c of what I read here) most of you were not in favor of it. Anyway...I am stressing out about the balancing of chemicals. I feel like I need a phd to run my pool! I just purchased the TF-100 testing kit and am using test strips right now. So far I have 0 chlorine too much ph and alkalinity is off too. We threw in a packet of shock two days ago and it cleared up the pool right away. My question is how do you know how much of each chemical to put in? I believe we have 13,600 gallons of water in our pool. The pump seems to be working okay except for today the release valve on the top is not spewing water as forcefully as it did when we first cleared the air out of it. The psi is also not very far above zero even though it seems to be running fine. We turned it off for the night and while we are at work, but will turn it on again tomorrow around 5:00. Any advice would be helpful. I didn't realize how all consuming this adventure would be! I should probably change my name to New and Confused and Freaking Out!