Iím currently deciding whether to go with a Stenner/bleach or an SWCG for chlorine automation; itís tied to a complete electrical upgrade and prep for solar, so the finances get interwined a bit (e.g. an Easytouch with IC40 isnít much more expensive than a Stenner + SunTouch).
This is a 60 year old pool with copper piping underground; do I have to worry about that with SWCG levels of salt in the water?
The deck is concrete; the only other metal nearby is the light niche (the conduit and light itself is going to be replaced, but the conduit will need to be red brass to maintain bonding), the diving board supports, and some metal support posts for the shade structure roof (already showing some rust, so Iíll clean and paint them anyway). All vintage 1960s.
When calculating cell life, is it the time actually generating chlorine, or the time with power available and water flowing? E.g. If I have a 10000-hour rated cell, running 8 hours per day at 50%, that should be 2500 days (~7 years if year round), not 1250 days (~3.5 years), right?
Sizing -- looking at the IC40 for my 21k-25k (depending on how I feel about it pool. Last summer, the peak days with the cover off saw up to 4ppm use @ 40ppm CYA, but the summer before when we moved in, at 80ppm CYA I think it was closer to 2ppm FC/day. Since Iíll up the CYA level, it seems an IC40 can add 2.5ppm in 8 hours if I calculate right. Most days use less esp. with the cover on, and having to boost with a bit of liquid on a few heaviest use days doesnít seem like a big burden, but I donít want to have to do that every day. The IC60 is enough more expensive (and isnít available with an EasyTouch bundle with the transformer built in) that I donít want to do that unless necessary.
Anything else I should take into account? Iím wavering between this and a Stenner solution; for what Iím doing they end up pretty close in cost over time once I calculate chlorine, cell replacement, etc. Like I said this is part of a bigger electrical overhaul, so Iíll have more questions and posts as we get farther.