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Forum: Dealing with Alkalinity and Calcium

High alkalinity and calcium levels are much trickier to resolve than the pool books indicate

  1. Exclamation Sticky Thread Sticky: FAQs & HOWTOs: Swimming Pool Alkalinity

    HOWTO: Step-by-Step Guide to lowering your alkalinity The HOW-TO has moved here: lowering-swimming-pool-alkalinity-step-by-step.html You should...

    Started by PoolDoc‎, 03-29-2006 10:50 AM
    • Replies: 2
    • Views: 54,142
    06-05-2006 01:53 PM Go to last post
  1. Calcium hardness and fiberglass pool

    Should I be concerned with a CH of 100 in a fiberglass pool? FC 3 Ph 7.4 TA 120 CYA 40 TDS 500 water is perfectly clear although I have...

    Started by aguaguy‎, 07-28-2006 04:09 PM
    • Replies: 2
    • Views: 7,098
    07-30-2006 04:35 PM Go to last post
  2. Calcium hardness and fiberglass pools

    I have a small (7000 gallon) fiberglass pool with sparkling clear water using BBB method FAC 5 PH 7.6 TA 80 CH 120 CYA 50 Went to Leslie's...

    Started by aguaguy‎, 05-12-2008 03:43 PM
    • Replies: 4
    • Views: 14,218
    05-13-2008 03:17 AM Go to last post
  3. high calcium

    I finally have my new testing kit (K-2006C), and I am enjoying revisiting basic high school chemistry labs. Most of my numbers are good (see below)...

    Started by alisonquilts‎, 06-10-2012 04:04 PM
    • Replies: 4
    • Views: 6,195
    06-10-2012 07:03 PM Go to last post
  4. Will TSP to lower calcium hardness???

    I've read on a few sites that adding TSP (trisodium phosphate?) will lower the calcium hardness in a swimming pool but I haven't found any clear...

    Started by amanda_easternon‎, 06-06-2006 08:27 PM
    • Replies: 8
    • Views: 13,872
    06-07-2006 06:57 PM Go to last post
  5. Adding calcium...when & where

    I need to add calcium to our pool and I think I need to do it soon. (concrete/plaster pool Calcium level at 100) I have been keeping my chlorine...

    Started by AndieP‎, 07-10-2006 12:29 PM
    • Replies: 4
    • Views: 3,588
    07-10-2006 01:32 PM Go to last post
  6. Scale?

    Hi All! I really hope this is an easily answered question...My hubby took off our cover this past Wed. night, we planned on doing this on the...

    Started by Andrea B‎, 05-28-2012 01:29 AM
    • Replies: 4
    • Views: 5,964
    05-29-2012 07:33 PM Go to last post
  7. High TA in fill water

    I got a sample of fill water from a friend to test for iron. I ran a full set of tests to see where he would be starting. Here are the results: pH...

    Started by AndyJ‎, 06-09-2010 09:44 AM
    2 Pages
    1 2
    high ta fill
    • Replies: 11
    • Views: 8,496
    06-10-2010 10:01 PM Go to last post
  8. low alkalinity

    Ok...so I have a 2500 splash pad (slide, water features). For the last couple weeks I can't keep my alkalinity up. I am continually adding alkalinity...

    Started by angiedubberke‎, 08-19-2014 08:01 PM
    • Replies: 2
    • Views: 11,008
    08-20-2014 11:32 AM Go to last post
  9. Pool store advice to lower alkalinity - three day muriatic acid dose method

    15,000 gallon IG plaster Alkalinity here is naturally high out of the tap, pool tested at 220ppm. Their test said pH was 8.2, all mine say it's...

    Started by aquarium‎, 06-28-2006 09:57 PM
    2 Pages
    1 2
    • Replies: 14
    • Views: 28,643
    07-03-2006 10:04 PM Go to last post
  10. An interesting water map - image

    This might help to start off knowing your water. 'Hardness' is related to calcium hardness and alkalinity. We recently moved west about 90...

    Started by aquarium‎, 06-29-2006 10:59 PM
    hardness, pix, sticky
    • Replies: 1
    • Views: 5,432
    07-02-2006 09:18 PM Go to last post
  11. Mystery bucket of chemical - what is it?

    We bought a house w/pool in April. The previous owner left some surprises, one of which is a bucket of chemical without a label. It's a white plastic...

    Started by aquarium‎, 07-05-2006 10:17 AM
    • Replies: 4
    • Views: 3,982
    07-05-2006 12:37 PM Go to last post
  12. Plaster pool has a 'natural' pH maybe?

    I used the aeration method to lower alkalinity from 230ppm to 90ppm. Although the amount of acid now consumed has dropped a lot, the pH insists on...

    Started by aquarium‎, 07-13-2006 05:22 PM
    • Replies: 2
    • Views: 3,026
    07-17-2006 07:52 PM Go to last post
  13. Removing calcium and magnesium?

    Is there a relatively safe way to precipitate calcium and magnesium out of the water? My fill water is very high in both and I think it's causing the...

    Started by aquarium‎, 08-17-2006 09:20 AM
    2 Pages
    1 2
    • Replies: 13
    • Views: 12,644
    09-06-2006 11:41 PM Go to last post
  14. Lowering alkalinity raises TDS - What is it?

    The procedure for lowering alkalinity results in higher total dissolved solids (TDS). Probably not an issue with pools, but I'm using the technique...

    Started by aquarium‎, 09-11-2006 08:53 AM
    • Replies: 6
    • Views: 8,412
    09-11-2006 04:09 PM Go to last post
  15. Household Chemical for hardness

    Is there a household chemical I can use to increase water hardness?

    Started by arobinstk‎, 05-15-2012 08:13 PM
    • Replies: 5
    • Views: 9,066
    05-25-2012 12:11 AM Go to last post
  16. Airate with Spill over Spa

    To lower my ALK can I use my spill over spa in Spill over mode ? (Not recirculate in the spa) It has 6 jets that can bubble a lot or does it need...

    Started by aswetich‎, 09-05-2006 09:00 AM
    • Replies: 2
    • Views: 7,085
    09-06-2006 08:28 AM Go to last post
  17. Thumbs up Calcium Hardness increasing (just curious)

    We had a monsoon that flooded our pool, so it took a couple days to get it back in order. I have been taking daily readings and noted that CH test...

    Started by banjeman‎, 06-02-2014 06:35 PM
    • Replies: 2
    • Views: 8,955
    06-02-2014 10:53 PM Go to last post
  18. Pool Calcium levels

    Several months ago we moved into a beachfront house with a VERY large pool--about 33,000 gallons. I have been maintaining it. It tends to prefer a...

    Started by beachfrontpool‎, 08-11-2012 02:59 PM
    • Replies: 8
    • Views: 10,661
    08-22-2012 11:39 AM Go to last post
  19. How to lower Alkalinity without acid

    I have a round 24' pool 52 inches high, with a hayward gas pool heater,hayward sand filter. I use a lamotte pro 9 test kit. I had some mustard algae...

    Started by bearsprague‎, 07-14-2013 08:41 PM
    • Replies: 3
    • Views: 6,861
    07-25-2013 07:32 AM Go to last post
  20. Higher CH and cloudy water

    Hi all, My calcium hardness has almost been around 150. We recently had a weeks worth of rainy weather. My pool water got cloudy shortly after....

    Started by beaverplt‎, 07-06-2021 10:25 AM
    • Replies: 0
    • Views: 1,588
    07-06-2021 10:25 AM Go to last post
  21. Question Help with total alkalinity (complicated)

    I have an inground, vinyl liner pool (new liner last year) without a heater. I just had my water tested. Everything was OK except the TA measured...

    Started by bfguilford‎, 06-19-2006 09:53 AM
    • Replies: 0
    • Views: 5,223
    06-19-2006 09:53 AM Go to last post
  22. New here

    Hello all :) Great forum! New pool owner. I'll save my questions for after doing some reading first. Just wanna say thanks for having a great...

    Started by Big Splash‎, 06-03-2014 08:26 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 127,512
    06-09-2014 09:24 PM Go to last post
  23. Baking soda turned my pool green

    My ph was low (a constant problem), reading below the minimum 7.0 on my Taylor test kit, so I added a box of Borax. This created a little cloudiness...

    Started by BigStein‎, 08-10-2007 07:06 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 52,100
    08-12-2007 12:10 PM Go to last post
  24. Should I raise CH?

    Just recieved my new kit which includes all the important test, so I was able to do the whole spread: FC= 2.4ppm CC= 0.0ppm TA= 110ppm CYA=...

    Started by BillyBumbler‎, 05-24-2006 02:01 AM
    • Replies: 1
    • Views: 5,284
    05-24-2006 06:52 AM Go to last post
  25. My pool loves low TA

    When I try to hold a TA of 80, my PH tends to rise faster requiring more frequent acid applications, which brings the TA down to around 50-60...where...

    Started by BillyBumbler‎, 02-06-2007 08:47 PM
    2 Pages
    1 2
    • Replies: 11
    • Views: 8,317
    02-07-2007 08:55 PM Go to last post
  26. Bead blasting tiles?

    I'm having some difficulty cleaning some very VERY stubborn calcium tile staining emanating from a rockfall. I used acid, but had to use so much to...

    Started by BillyBumbler‎, 05-16-2007 09:31 PM
    • Replies: 1
    • Views: 3,468
    05-26-2007 08:25 PM Go to last post
  27. Alkalinity reduction

    My Taylor book claims if you slug muratic acid in the pool rather than spreading it and splashing it, you will lower TA rather than reducing ph. Is...

    Started by bizbad‎, 03-08-2007 07:50 PM
    • Replies: 1
    • Views: 6,377
    03-08-2007 09:26 PM Go to last post
  28. stain/scale on bottom of pool

    Hello. Been a reader here for years but this is my first post. I have a tan colored stain/scale on the bottom of my in ground 25,000 gal. vinyl pool....

    Started by bjseeberg‎, 06-11-2012 01:56 PM
    • Replies: 5
    • Views: 10,021
    06-13-2012 10:07 PM Go to last post
  29. High PH and Correct Alk

    Hi, I have a concrete indoor pool with a coverstar electric cover. I have been battling with pool water chem for several months now. My PH is...

    Started by blentz‎, 06-13-2012 08:04 PM
    • Replies: 2
    • Views: 5,374
    06-14-2012 01:34 AM Go to last post
  30. Alkalinity High and pH low

    Just joining the pool world. Starting with 16ft 48" above ground Intex before we go bigger. Having a tough time bringing the alkalinity down without...

    Started by BMomma‎, 06-16-2014 02:42 PM
    • Replies: 6
    • Views: 15,191
    06-17-2014 06:59 PM Go to last post

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