I just want to shout out a BIG thank you to TFP. We have 18 foot x52" Intex ultraframe that was set up the second week of July 2014. We followed all of TFP guidelines and had a wonderful "half season" last year. Put the pool to sleep for the winter following guidelines and just opened it last weekend to......a gorgeous, clear, almost totally clean pool! No frog pond! No having to shock! Just waiting for the temp to warm up and then we'll have our first "full season" Thank you Thank you Thank you! This is the ONLY way to keep a pool!