Recent content by CPO

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    Remove Light Staining from Tile

    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...
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    $120 Chemical controller

    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...
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    Logistics for Change from Cal Hypo to Sodium Hypo

    We have to circulate water 24/7 no timer here - I've considered installing a basic IOT outlet (always has the correct time, can monitor & control remotely) but it's one more point of failure in an area with high humidity area and corrosive chemicals. I’ve reached out to 4 companies recommended...
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    Logistics for Change from Cal Hypo to Sodium Hypo

    It would definitely be an option, however the start-up costs are considerable and as an entity that relies solely on donations (we do not charge fees for service as our clients largely could not) Thus it is money we do not have. I could plead the case to a grant institution that the SWCG...
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    Logistics for Change from Cal Hypo to Sodium Hypo

    Glad to have the confirmation that premixing cal hypo is not the way to go - We certainly won't peruse that anymore. We have no system for any chemical additions at the present, so I'm unfamiliar with the dosing pump side of things. It looks like you can set a specific value and they'll...
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    Logistics for Change from Cal Hypo to Sodium Hypo

    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...
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    Indoor Pool Shock

    We use only cal hypo. Nothing else.
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    Indoor Pool Shock

    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...
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    Replacing a Main Drain Sump

    Painting a Main Drain Sump So...good news. For the first time, one of the contractors actually poked around a bit & they found that what everyone had though was the disintegrated remains of the sump was actually just rusted scale built up over the last 40 years. From what we can tell, the box...
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    Replacing a Main Drain Sump

    There is only one 'Pool Professional' in our region who handles commercial pools & they are too busy shutting in residential pools to be bothered with a 'simple job' like ours. They told us to work with a concrete guy who would know what to do. They didn't, nor have any other concrete person...
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    Replacing a Main Drain Sump

    Because the drain is gravity fed and not connected to a pump, we do not need to go to extremes (2 drains, etc). The cover is the only mandated change. As long as the sump shape meets regs, it is good to go. The 'Professional Pool Company' said, and I quote, "Any concrete guy will know how...
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    Replacing a Main Drain Sump

    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...