Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 18 of 18

Thread: I let my ph go low, now I have trouble

  1. Back To Top    #1

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    I let my ph go low, now I have trouble

    I let my pH slide low this year down to 6.8. It's been slowly sliding since I opened 2 months ago. I finally brought the ph back up to 7.2+ and the liner got brown stained, the water got a little cloudy and has a green tint.
    Fc 8
    Cya 100
    Ta 100
    Ca 140
    Ph 7.2+

    Ascorbic acid test takes the stain out.
    I added some good metal out and some iron precipitated out on the bottom of the pool.
    It's been 24 hours. Water still looks green and slightly cloudy. Stains are lightening a little.

    What's my next move?
    I could drop the ph and get the copper and iron back into the water then do some water changing.....
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

  2. Back To Top    #2


    TFP Guide

    cowboycasey's Avatar
    Join Date
    Jul 2013
    Location
    Fletcher, OK
    Posts
    3,346

    Re: I let my ph go low, now I have trouble

    I wish I knew more about metals in water, but I do not. From you numbers the CYA sticks out to me, do you know for sure your CYA is 100, that is the highest a CYA test will go. also with a FC of 8 your barely above minimum of 7 for your CYA level, are you taking the FC above or to 12 every day?
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

  3. Back To Top    #3

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    Cya is probably a little higher. I should try diluting and run the test again. Chlorine seems to be holding. I haven't been shocking daily. I should probably break out the big kit and make sure. I do have non copper algecide 60 in the pool.

  4. Back To Top    #4
    morzh's Avatar
    Join Date
    Jul 2015
    Location
    Jackson, NJ
    Posts
    238

    Re: I let my ph go low, now I have trouble

    With CYA this high no wonder chlorine is holding.
    Seasonal World rectangular pool, 27K gallons (data sheet), 25.3K calculated
    Jandy Stealth JHPU 2.0 PUMP, 2HP
    Jandy CL340 cartridge filter
    Pentair C320 inline chlorinator
    AquaComfort heatpump heater

  5. Back To Top    #5

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    Cya 160
    Fc 6.5

    - - - Updated - - -

    So do I slam first or dilute first?

  6. Back To Top    #6


    TFP Guide

    cowboycasey's Avatar
    Join Date
    Jul 2013
    Location
    Fletcher, OK
    Posts
    3,346

    Re: I let my ph go low, now I have trouble

    so, poolmath says to go from a CYA of 160 down to 50 you need to replace 70% of you water...

    If you empty 50%, that would take you down to 80 CYA but your SLAM level would still need to be above 31 FC and that is a lot of bleach, you really need your CYA between 30 and 50 to do the SLAM...

    - - - Updated - - -

    you need to know your water table level before you empty more than 40% of your pool water, you do not want your pool to pop/float out of the ground..
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

  7. Back To Top    #7

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    No. I've lowered to 12" in shallow end successfully several times. That will get about 40% of the water by my math. So will have to do that twice to make some headway.

  8. Back To Top    #8
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,998

    Re: I let my ph go low, now I have trouble

    I don't know much about metals either, here is an article from pool school, Pool School - Metals in the Water and Metal Stains.

    You should dilute CYA before SLAMing. With CYA of 160 the shock level for your SLAM will be 62 ppm. Chlorine CYA Chart
    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

  9. Back To Top    #9

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    Thanks all for helping me see the alge problem! Pumping the pool down now. I need to ban trichlor from my pool! Swg or liquid is in my future.

  10. Back To Top    #10
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,998

    Re: I let my ph go low, now I have trouble

    Good plan!

    While you wait for your pool to drain how about adding your pool info to your signature as shown here, Pool School - Getting Started
    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

  11. Back To Top    #11

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    Quote Originally Posted by pooldv View Post
    Good plan!

    While you wait for your pool to drain how about adding your pool info to your signature as shown here, Pool School - Getting Started
    For some reason my signature only shows in the first post. I'll look for a setting.

  12. Back To Top    #12

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    Drained and replaced water with city water. About 4,000 by adding water in the deep end while pumping out of the shallow end followed by 10,000 refill. (total volume of pool is estimated at 20,000) water added as measured by the city water meter.
    Shot home at lunch to turn the water off.
    TA 120
    pH 7.2
    CYA 80

    So I added 68% cal hyp to get to slam level of 31. Confirmed.

    Just then the reinforcements arrived with 20 gal of 12.5%.

    So I added liquid to get to 44 to hold it over till after work.
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

  13. Back To Top    #13


    TFP Guide

    cowboycasey's Avatar
    Join Date
    Jul 2013
    Location
    Fletcher, OK
    Posts
    3,346

    Re: I let my ph go low, now I have trouble

    perfect, your CYA will continue to go down when you backwash, you can make it with a CYA of 80, you already know where you have to be at to SLAM.. If you need anything ask away and we will try to help

    Try to keep your FC above SLAM level, so for CYA of 80 you want it above 31, so shoot for 35/36 and let it fall to 31 and do again.. Your SLAM will go much faster
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

  14. Back To Top    #14

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    6 hours later:
    FC 44......

    So in 6 hours the FC hasn't moved from the initial slam. Water looks the same......

    Doesn't seem like it should have held at the calculated first dose if there was an algae problem.

    pool is still light green and lightly cloudy.

    The good news is that the CYA is in a much better spot and I'm motivated to kick the Tri-chlor habit.

    Any thoughts on what is going on and what I should try next?
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

  15. Back To Top    #15
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,200

    Re: I let my ph go low, now I have trouble

    You did say you had iron in the pool? Did a test confirm this? Is the water clear green or cloudy? Is your liner blue?
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  16. Back To Top    #16

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    Quote Originally Posted by zea3 View Post
    You did say you had iron in the pool? Did a test confirm this? Is the water clear green or cloudy? Is your liner blue?
    I have a stain on the liner that comes off super easy when touched with vitamin c. Added metal out and a bunch of rust fell out of the water and landed on the bottom.
    Water is slightly cloudy green. Cannot see the bottom of the deep end.

    This all started with 2 months of 6.8 ph. When I corrected the ph, the green and brown stain appeared within 24 hours. Crystal clear before that.

    - - - Updated - - -

    image.jpg

    - - - Updated - - -

    Liner is light blue
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

  17. Back To Top    #17

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    We had a big rain storm last night.

    FC 34 this morning.
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

  18. Back To Top    #18

    Join Date
    Jun 2012
    Location
    Kalamazoo, MI
    Posts
    44

    Re: I let my ph go low, now I have trouble

    The light of day reveals that the alge is dying! Starting to flip to the white cloudy blue!
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

Posting Permissions

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