Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: pool solar cover causing ph rise

  1. Back To Top    #1

    Join Date
    May 2014
    Location
    Inverness Fl
    Posts
    49

    pool solar cover causing ph rise

    thought I had read that keeping a cover on at night, would help lower ph, but the opposite is happening, the ph rises. I test all chem with the TF-100, and everything else is OK. But we started to keep the cover on at night to help maintain the temp. better, we have a heater also , I just tested the ph, it was 8.2. Is this normal? The ph has not acted this way before without the cover being on.

  2. Back To Top    #2

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: pool solar cover causing ph rise

    I've been using a cover for years and don't have a problem with any abnormal pH rise.

    Please add your pools info into your signature as outlined here - - > Pool School - Getting Started

    Do you have a spa attached to the pool ??
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

  3. Back To Top    #3

    Join Date
    May 2014
    Location
    Inverness Fl
    Posts
    49

    Re: pool solar cover causing ph rise

    don't have a spa--we got 1/4 inch of rain, but that never seemed to raise the ph like this before. I'm really stumped, the solar cover is the only thing we have changed.
    mid 2014 12 X 30 12k gallons IG Plaster\Fl Gem Finish. StaRite\Pentair DE filter. StaRite\Pentair IntelliPro VS Pump. Pentair UltraTemp Heat Pump Unit. Intellichlor IC40 salt system (not up and running yet)
    Very hard well water-no iron. TF-100 Test Kit (the best)

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: pool solar cover causing ph rise

    Rain can cause PH to rise due to aeration of the water. There is no reason I can think of that a solar cover could cause PH rise. What is your TA?
    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

  5. Back To Top    #5


    TFP Guide

    domct203's Avatar
    Join Date
    Jun 2015
    Location
    CT
    Posts
    3,375

    Re: pool solar cover causing ph rise

    I use a solar cover every night and have no pH issues at all.

    Can you post a complete set of test results (FC, CC, CYA, pH, TA & CH)?

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

  6. Back To Top    #6

    Join Date
    May 2014
    Location
    Inverness Fl
    Posts
    49

    Re: pool solar cover causing ph rise

    tested this morning 10-2

    FC 6.5
    CC 6.5
    CYA 30-40 never sure what I think I see on this one
    PH 7.5 today added 1 1/2 cups of acid yesterday after seeing the rise
    TA 80
    CH 300

    my pool since last year likes a ph of 7.8 I have brought the TA down a couple of times from being over a 100, and the ph always comes back and settles in at 7.8 stays there forever. thats why this threw me, but there could be another reason I just remembered, I also read I think that using a solar cover at night, to reduce your chlorine by half, which I thought I did, enough, but I guess not. I keep the FC at 5 to 7, and the other day right before this, I noticed that when I put the power in the test beaker (from the tf-100) it was very very red, I knew FC was out of wack, and it was FC 13.5. So I had to let it come down, but could that be the cause of the sharp uptick in the ph.
    mid 2014 12 X 30 12k gallons IG Plaster\Fl Gem Finish. StaRite\Pentair DE filter. StaRite\Pentair IntelliPro VS Pump. Pentair UltraTemp Heat Pump Unit. Intellichlor IC40 salt system (not up and running yet)
    Very hard well water-no iron. TF-100 Test Kit (the best)

  7. Back To Top    #7

    Join Date
    May 2014
    Location
    SE, Wisconsin
    Posts
    46

    Re: pool solar cover causing ph rise

    A couple of things;
    You have listed cc of 6.5 I assume that that is a typo, since fc was also 6.5 if it is not a typo we have a problem.

    The PH test will not be accurate when FC is greater than 10. So on that particular day the results are invalid.

    The FC chlorine loss is from two things, organics and UV light. At night there would be no loss from UV so your cover should not have any bearing at night, Now during the day the cover (if opaque) will definitely lessen chlorine loss when covered.

    Hope this helps
    20,000 gal, 18 x 36 IG Vinyl, 1.5 HP Hayward 2610x152S two speed, Sta-Rite S870 sand filter, Raypak 265,000 BTU P-R26A-EP-C, TF-100 Test Kit

  8. Back To Top    #8

    Join Date
    May 2014
    Location
    Inverness Fl
    Posts
    49

    Re: pool solar cover causing ph rise

    your right--in my haste to post that-it should have been

    FC 6.5
    CC 0
    TC 6.5

    the high chlorine is definitely why the ph was a bad number then. the cover is opaque, we had left it on during the day, we had several different days we didn't get to swim much, putting the cover right back on, thought I had cut down on the chlorine enough to compensate for not losing much thru the days or at night. 1st time using a cover on the pool, and still getting use to it. didn't cut down enough, even though we were still swimming some, but not enough which is why the Chlorine got so high.

    all this came about because I just started using the cover, testing it with the Pentair Ultra Temp heat unit, to extend the swimming season. 1st time using the heat unit also. pool had never seen the cover on that much, equals less chlorine loss during the day, because the cover would go right back on to help hold the heat put out form the unit.
    mid 2014 12 X 30 12k gallons IG Plaster\Fl Gem Finish. StaRite\Pentair DE filter. StaRite\Pentair IntelliPro VS Pump. Pentair UltraTemp Heat Pump Unit. Intellichlor IC40 salt system (not up and running yet)
    Very hard well water-no iron. TF-100 Test Kit (the best)

  9. Back To Top    #9

    TFP Guide

    Catanzaro's Avatar
    Join Date
    Jul 2014
    Location
    Monmouth County, New Jersey
    Posts
    2,179

    Re: pool solar cover causing ph rise

    Quote Originally Posted by ryker View Post
    thought I had read that keeping a cover on at night, would help lower ph, but the opposite is happening, the ph rises. I test all chem with the TF-100, and everything else is OK. But we started to keep the cover on at night to help maintain the temp. better, we have a heater also , I just tested the ph, it was 8.2. Is this normal? The ph has not acted this way before without the cover being on.
    Please advise on when you are adding liquid chlorine and when you are testing for PH? Adding bleach raises PH immediately, but as the chlorine is consumed, PH comes down, and everything is PH Neutral. Are you testing after adding liquid chlorine? Could this be the issue?

    How much does liquid chlorine raise PH for how long?

    You will find much more information if you search the forum on this matter. Thank you.
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

  10. Back To Top    #10
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,482

    Re: pool solar cover causing ph rise

    Intellichlor IC40 salt system (not up and running yet)
    Did you just start running the SWG but didn't update your sig?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

Posting Permissions

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