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Thread: New to the forum. Here's my data

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    Post New to the forum. Here's my data

    I have a 40,000 IG pool. Builders initially forgot to install overflow pipe and with torrential downpours this spring in Texas the pool overfilled for several weeks and the filter quit cycling and had to be cleaned several times before the cartridges were eventually replaced. Needless to say we had an algae explosion. Got that cleared up and have been enjoying the pool ever since.

    This AM results:
    FC 0.4
    CC 0.4
    pH 7.7
    TA 130
    CH 450
    CYA 80-85

    We have been using chlorine tabs but even those haven't been keeping the chlorine levels up. Currently have blackish mold dots in the shallow end. Guessing the CYA level is so high because the pool company shocked it so much to get it back from the murky depths plus the pool tabs. I don't have any plans on replacing the water as I had it trucked in to the tune of $500/load.

    Next plan is to shock with bleach today and tomorrow and turn off the pool tab.

    Thoughts?

    I also have an ozonater but i realize it doesn't do much during the summers here in Texas.
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

  2. Back To Top    #2
    Texas Splash's Avatar
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    Re: New to the forum. Here's my data

    Welcome to TFP! Simply put, you'll need to increase your FC based on the Pool School - Chlorine / CYA Chart. You can also use the
    Poolmath calculator to assist.

    You'll use a bit more bleach with that CYA, but due to your well situation I suppose you don't have an option.


    Oh, and those tabs/pucks raise your CYA as well. So you'll want to remove those right away.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Texas Splash's Avatar
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    Re: New to the forum. Here's my data

    Geez, I'm sorry. In my initial post above (edited) I got locked into your previously comment about green water. Disregard the SLAM if your water is clear for now. Simply increase the FC based on the CYA chart link above. Match your FC to the appropriate CYA level (Target or slightly above) and you should be fine for now. If the water should change later, then you may need to SLAM.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  4. Back To Top    #4

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    Re: New to the forum. Here's my data

    Thanks for quick response. So even if I have the blackish algae dots in the bottom of pool standard chlorine level will suffice? Water is crystal clear, but the little mold dots are persisting. Did an overnight chlorine loss test a couple nights ago and it dropped from 6 to 1.8ppm. Thanks in advance.

    Grey
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

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    Texas Splash's Avatar
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    Re: New to the forum. Here's my data

    The loss of FC during your last OCLT confirms you have some algae stealing your chlorine. So in that case, a SLAM would be appropriate. Have you ever done a SLAM before? Here is the page: Pool School - SLAM - Shock Level And Maintain. Yes, regular bleach is what we use. Because of your high CYA, it will require more bleach (generic is fine), but that's better than taking a chance on getting replacement water with metals. Read the SLAM page carefully and do everything it states until you pass the 3 SLAM criteria. It will work. If after passing the SLAM, if you find that some spots are still persistent, we can readdress those areas specifically and a little more aggressively. If you have any more questions, please ask. Good luck!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  6. Back To Top    #6

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    Re: New to the forum. Here's my data

    ok so according to the SLAM guidelines and the pool calculator I need to get my FC level up to 31. So with that I have added 12 gallons of 10% bleach and 1 gallon 6% bleach. Will recheck in a hour or so and keep you posted.
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

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    Mod Squad pooldv's Avatar
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    Re: New to the forum. Here's my data

    Good plan.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: New to the forum. Here's my data

    Alright after 1 and 1/2 hours the fc dropped from 31 to 28. Added another gallon and 1/2 of 8.25% bleach. The fas/dpd test tube still had the tinniest bit of pinkish purple to it, so i went up to 70 drops from 56 and it never truly cleared, so I chose 56 drops when the first color changed. So 56 x 0.5 = 28
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

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    Richard320's Avatar
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    Re: New to the forum. Here's my data

    Quote Originally Posted by gguff View Post
    Alright after 1 and 1/2 hours the fc dropped from 31 to 28. Added another gallon and 1/2 of 8.25% bleach. The fas/dpd test tube still had the tinniest bit of pinkish purple to it, so i went up to 70 drops from 56 and it never truly cleared, so I chose 56 drops when the first color changed. So 56 x 0.5 = 28
    You could go down to a 5 ml sample and each drop will then count as 1 FC. It's not precise enough to do the overnight loss test, but it will speed up the FC test and save a lot of R-0871
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: New to the forum. Here's my data

    Thanks for the info. I don't have a 5ml line but I do have a medicine cup I can use to put 5ml into the tube.

    Last question for the night. Started this at 4pm, I know it can take days for a SLAM to pay off. Am I better to try and do an OCLT overnight tonight, or dump more bleach in than I need to keep the Fc high so I don't have to check it tonight but it stays high to keep the SLAM beneficial??

    - - - Updated - - -

    I should also add that I was gone from 6:30pm-10:00pm tonight and it dropped from 31 to 25, so not terrible, but still not stable added 3 gallons of 8.25%. I'll check the CC at 11pm
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

  11. Back To Top    #11

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    Re: New to the forum. Here's my data

    I know this is a late response, but, given the history, I wouldn't bother with OCLT yet tonight.
    18' x 48" ring top pool (Summer Escapes); 5500 gallons; set up June - October, stored during winter; Intex 2500 gph pump (B size cartridge filter) Hayward 21" sand filter + 1.5 hp single speed Powerflo Matrix pump (upgrade October 2016) *** K-2006 test kit, refills from tftestkits

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    Re: New to the forum. Here's my data

    Well my hope got the best of me and I ran an OCLT. Fc down from 31 to 22, but CC held steady at 0.5 so added 5 more gallons of 8.25%. Almost out of Reagent. Black spots seem to be fading. Have brushed the pool 4 times in the last 24 hours.
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

  13. Back To Top    #13

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    Re: New to the forum. Here's my data

    Order some more reagent - at that rate of consumption you're likely not near the end of the SLAM yet.
    18' x 48" ring top pool (Summer Escapes); 5500 gallons; set up June - October, stored during winter; Intex 2500 gph pump (B size cartridge filter) Hayward 21" sand filter + 1.5 hp single speed Powerflo Matrix pump (upgrade October 2016) *** K-2006 test kit, refills from tftestkits

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    Mod Squad pooldv's Avatar
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    Re: New to the forum. Here's my data

    Agree, that is a lot of chlorine consumption, both last evening and last night. Brushing along with testing and adding chlorine every couple of hours are the two best things to do to speed up a SLAM.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: New to the forum. Here's my data

    found a stainless steel brush in the garage. The black spots laugh at the nylon brush. FC at 33-34 currently, so I am going to wait a couple hours and let it come down before I hop in the pool and scrub.
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

  16. Back To Top    #16

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    Re: New to the forum. Here's my data

    hopped in the pool with goggles on. FC=30 found as many black spots as I could and scrubbed them off. The spots oxidize and turn a dull gray with violet/purple, but once you scrape them off there is green underneath. Hopefully that will do the trick. Been doing my FC samples this afternoon with 5ml as suggested to save reagent. averaging 31-34
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

  17. Back To Top    #17
    Agent99's Avatar
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    Re: New to the forum. Here's my data

    Good job! Keep it going. Persistence and preparation pays off.
    ----Chris----
    25k IG/Spa Figure 8, 18x36, Pebble Sheen Blue Granite, Sta-Rite S8M150 Cartridge Filter, Pentair 460805 400k BTU Heater & 011018 IntelliFlo VarSpd
    Liquidator, Fafco Solar Heat, Polaris PB460 Booster Pump w/280 cleaner, Katchaleaf Cover, TF100 Test Kit, FAKE MAIN DRAIN

  18. Back To Top    #18

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    Re: New to the forum. Here's my data

    Thanks. It's a pain in the arse, but worth it i think. Bottom of the pool is clean as a whistle and holding within 1ppm fc shock level every 2 hours in the hot Texas sun. maybe tonight is the night. If not the wife might kill me.
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

  19. Back To Top    #19

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    Re: New to the forum. Here's my data

    Last post for tonight. My FC test has been reading 30-31 all day. Ran out of reagent r-0871 on second to last test which read 30. Added 1/2 gallon 6% bleach to get me to 31. Rechecked 1 hour later with new bottle of reagent. Read 28.5?? Rechecked and read 28.5 again. Guessing some variation in the reagent?! What do y'all think?
    40,000 gallon in ground
    Plaster/Pebble
    Cartridge Filter
    Diving pool
    Fill via well

  20. Back To Top    #20
    Mod Squad pooldv's Avatar
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    Re: New to the forum. Here's my data

    That is odd. Was your test kit old or stored outside?
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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