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I’m responsible for a 100,000 gal indoor pool for my nonprofit org. Previously, it was fed cal-hypo and HCl, but we recently switched to NaOCl. In the location where chemicals were tossed in the pool previously, the tile is lightly stained - (see pic) almost looks like a shadow but it’s worse...

If I had an extra $120 to blow, I’d love to see how this would work as a cheep chemical controller for a pool. Digital pH ORP Redox 2 in 1 Controller Monitor w/ Output Power Relay Control https://www.amazon.com/dp/B00MG7LNFG/ref=cm_sw_r_cp_api_i_iB5qEb9R8XBCG I don’t understand the crazy costs...

My non-profit org has an indoor 100,000 gal pool that has been using granular 65% Cal Hypo for decades. I'm looking into switching to liquid Sodium Hypo. Primarily due to the hard water issues that are a pain - Hardness test was over 1200 last week! Refill water hardness is already 250-300...

We had a FC reading of 2 and a CC reading of 3 on a 100,000 indoor pool with a great ventilation system. Yesterday, we added 10lbs of cal-hypo as we attempted to raise the FC to 10 to break point chlorinate and only reached a 7.5 today with CC of 1.75 after 22 hours. We cannot use CYA and...

The pool where I work was built in 1970 with concrete and a ceramic tile surface. It holds 100,000 gal and has a single main drain which is gravity fed to a D.E. filtration tank that has a max output of 225 GPM. The main drain is about 27"Lx22"Wx24"D When the pool was drained to replace the...