Hey There,

Thanks for all the info.... the BBB article is very interesting. Thanks Ben!

I'm not looking to get more time from my liner.....I just don't want to bleach / fade it out fast. The last few years of shocking I've sometimes sent it thru the skimmer, and others broadcast in over the pool and watched it sink to the liner floor. I believe thats how I did all the damage.

I'm going to follow your recipe and use liquid bleach..... i'll pour it in the pool at the return as mad will suggested. I'm going to have to do a better job with my ph. It's odd cause my neighbor has the exact same heater as me.....never checks his ph and has never had to change his exchanger.

What I meant about the check valve is I have 1...actually 2 inline between my clorinator and the heater....

I'll have to try hard to eliminate all potential causes of the exchanger going... I'll watch my ph closer, and not shock or put any chemicals into the skimmer. Of course everyones pool, water, ect is different but if you had to take a wild guess of how often to put a gal of bleach in the pool to maintain a good fc level what would you guys think?

Thanks much
cooper