A friend who builds pools recently suggested I consider a CL Free system. It says it uses copper, what I guess is an ozone system and controls pH with CO2. I am skeptical of adding copper due to the potential for discoloring my water. I think I have also read some things that pH monitoring systems are unreliable. I have had really good luck since adopting the TFP method. But I am curious. FYI, I have a Frog system also. This year, I am going to keep using it, but will not replace the "metals" cartridge. I will leave the old cartridge in to hold the BacPac trichlor cartridge, but do not want to put the metals in. And I understand the hazard of trichlor and the resulting boost of CYA levels and what that can cause. But I like having something that will give the pool a steady low dose of chlorine to minimize the liquid dosing needed when the pool is not used for a few days. And I am testing regularly and thoroughly, so I can avoid the CYA trap from the trichlor.
Thoughts on the CL Free system?