Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: I'm in over my head!

  1. Back To Top    #1

    Join Date
    May 2012
    Location
    Yuma, Az. 85365
    Posts
    3

    I'm in over my head!

    Well... First the site has been very helpful, but my first post on here.I'm out here in Yuma, Az. It's hitting the 100's and I just took over duty on a 197,000 gallon pool here on the Army base. It is a SWC pool. They fought all last summer to keep the chlorine in it. I found the stabilizer was non existent in it.Salt content is dead on. I got the chlorine readings up to 5.0ppm....Too high they want it at 3.0ppm. They shut down the pool today and I'm looking for quick advice. I cant figure out how much neutralizer to put in the water without killing all my work. All my tests and chems are dead on but they want it at 3.0ppm. I need it open quickly. I have tried searching charts,etc which got me here to TFP. Any suggestions, time is not on my side at this point? Thanks in advance,Mark

  2. Back To Top    #2
    Isaac-1's Avatar
    Join Date
    May 2010
    Location
    SW Louisiana
    Posts
    6,711

    Re: I'm in over my head!

    3ppm is a perfectly acceptable chlorine level if you maintain a low level of CYA stabilizer of only 20 ppm, the problem is in order to get away with only 20 ppm of CYA in a pool exposed to a lot of sun light you would have to install massively oversized SWG's to produce enough chlorine to beat the losses to the sunlight. The underlying question is why the 3 ppm FC limit?

    Ike

    p.s. in my limited experience a little bit of chlorine neutralizer goes a long way, I suspect even on a pool yours size it would only take a couple of pounds or so to drop you FC by 2 ppm (well maybe 3 or 4 pounds, I do remember using it in an emergency I had with my pool and used only about 1.5 pounds to drop 6 or 7 ppm of FC, of course your dealing with a pool 5 times bigger or so)
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

  3. Back To Top    #3

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: I'm in over my head!

    Arizona state codes for commercial/public pools (what they call "public or semi-public") require chlorine to be from 1-3 ppm (bromine from 2-4 ppm; spas from 3-5 ppm chlorine or bromine) based on the DPD test or the ORP being at least 650 mV (no upper limit!).

    Since you are using a saltwater chlorine generator, then if you want to prevent algae growth without using any supplemental algicide (e.g. Polyquat 60) or phosphate remover, then with 3 ppm FC max you shouldn't have the CYA be any higher than 60 ppm. Though this means that you will have to size your chlorine generator higher than you would if you could do 4 ppm FC with 80 ppm CYA, it should still be reasonable for you.

    Of course, if this is a residential pool, then what is the issue? It sounds like this must be a commercial/public pool. [EDIT] I see from your initial post that it is a very large pool so clearly in the "public or semi-public" category. [END-EDIT]
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  4. Back To Top    #4

    Join Date
    May 2012
    Location
    Yuma, Az. 85365
    Posts
    3

    Re: I'm in over my head!

    Thanks for the quick replies! Isaac it has 24! Pentair cells! That's been the problem here is the CYA has never been set. I got it right (I think) and these things are cranking it out. We see temps near 120 and pool water in the 90's so I don't want to drop everything out with the Neutralizer. Well heading out to check it again. I think I'm going to add 3 more pounds of Neutralizer (I put three in yesterday) and see where she goes.Thanks for the input guys, I will update later,pm

  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,342

    Re: I'm in over my head!

    You are doing what you need to do. Just keep adding the Thiosulfate a little and test about an hour later Keep the pumps running and shut the swcg's off until you get to about 3 ppm FC.

    Once you get it close to 3 ppm fire the swcg's back up and run the percentage down about 25% from where it is now. You'll have to watch it pretty closely the next few days in order to get the swcg's dialed in to keeping the FC at 3 ppm.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  6. Back To Top    #6

    Join Date
    Aug 2011
    Location
    Metro Atlanta, Georgia
    Posts
    161

    Re: I'm in over my head!

    Below is a chart from an old spreadsheet I have laying around. I cannot vouch for the accuracy. The instructions on an old bottle states 2 oz per 10K gallons (equals 39.4 oz in a 197K pool) reduces Chlorine 1 ppm. I am assuming the bottle is not 100% Sodium Thiosulfate, so the dosage would depend on your percentage. Hope this helps.

    To Decrease Free Chlorine Using Sodium Thiosulfate ; 5-Hydrate (100%) in 197,000 Gals
    Decrease
    in ppm Ounces
    1 ppm 27.58
    2 ppm 53.19
    3 ppm 80.77
    4 ppm 106.38
    5 ppm 133.96
    10 ppm 267.92
    15 ppm 401.88
    20 ppm 535.84
    30 ppm 803.76
    50 ppm 1339.60
    My cement pond is a 36K gunite 20X40 built in mid 1960s, Hayward S244S filter, Aquarite SWCG, Jandy 1.5HP 2sp, TF-Test kit and Nitro Wall Climber

  7. Back To Top    #7

    Join Date
    May 2012
    Location
    Yuma, Az. 85365
    Posts
    3

    Re: I'm in over my head!

    I went out and discovered the cells were stuck in the "boost mode' I can't seem to get them out of Boost mode. It does not have a main control box as stated in the Pentair manual. I'm waiting for a reply from Pentair.Thanks Guys!

  8. Back To Top    #8
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,342

    Re: I'm in over my head!

    No wonder it's pounding the FC out!! (Pun intended)

    Post back what Pentair tells you.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •