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I have 18' intex 5400g pool and use tfp test kit for any figures I use. I am currently using a newer model intex swg made for up to 10,000g I believe and is connected to an oversize Hayward cartridge filter. Typical chemistry PH 7.2-7.4, ALK 80-90ppm, CYA 60-70, FC 6-8ppm. Seems everything...