Sacrificial Zinc Anodes for Saltwater Generators

[Tadpole]

I appreciate all the info, guys. Most of it is too technical for me. I'll just save my money on the zinc and use it to replace my ladder and such a few years down the road.

Thanks again!

[Poolsean]

Ben,

Using the following parameters for your pool, 200,000 gallons, circulation pump running 24/7, outdoor location, flat water (no water features), peak water temp of 86 degrees, and a maximum bather load of 500 ppl throughout the day, you need around 10 lbs/day of output to maintain residuals of 2-3 ppm.
The two units holding at 80% duty cycle, is this with the addition of the 25# cal hypo too? You will probably need to add the other two, and you mentioned having space for one more, which I would predict you will need, THEN you can greatly reduce the amount of cal hypo you are supplimenting with. (5) IC60 cells running around 40 -60% would be what I think you'll end up with.

As to why the pH is dropping... what is the pH of your source water? I'm sure you've experienced the steady to increasing pH of salt systems, so for it to be dropping, there's usually an outside interference causing this.