Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Loss of CYA and CH

  1. Back To Top    #1

    Join Date
    Oct 2015
    Location
    North Richland Hills, Texas
    Posts
    191

    Loss of CYA and CH

    Hello all!

    Over the winter I must have lost some CYA. Last summer I had a 70-80 CYA and now I tested and I only have 20-25. During the winter I typically only tested the FC/CC and PH. Which were always in line until last week. Last week my FC were at 1 (previously always at 4-5) w/ SWG running at 10%. So I ran the boost on the SWG and added some bleach to get it up to recommend levels rather quickly. This is when I tested CYA to notice the big drop. So I'm now running the SWG at 50% and it is keeping the FC in recommend levels. So I believe I just need to increase my CYA to get it to hold the chlorine so I'll be able to turn down my SWG % so it's not working so hard. I also had a drop in CH, previously was at 350-400, now I'm at 275. What would cause the drop in CH? Lots of rain? Is this bad for a plaster pool? Last question, I also for the first time have more than .5 CC it was at 1 today. Was this maybe due to adding the bleach for the first time last week? I'm not sure...Any help or guidance would be appreciated!

    FC 4.5
    CC 1 (always .5 or lower before today)
    PH 7.8 (just added 34oz MA)
    TA 90 (increased from 80 last week, hoping with dropping PH back down this will fall back in line)
    CH 275
    CYA 20-25 (do I just add liquid CYA, is there a brand from a pool store that's recommended...I'm fine w/ paying more for liquid for ease and time sake)

    *Weather related note if it matters we had about an inch of rain the day before yesterday
    *Water observations: Water looks crystal clear
    My Journey - 16x38 In-Ground gunite (14k gallons - 3.5-5-4) w/ Crystal Stones Smooth Tropical Isle - OK Flagstone coping - 693sqft spray deck decking - Jandy 580sqft Cartridge Filter - 2hp Jandy E Pump (VS) - Contracted Pool 4/22/16 - TF-100 Test Kit - 7x7 raised spa w/ rolled tile edge - Jandy nicheless LED lights (5) - Aqua Pure Salt Kit - Dolphin s300 robot - Zodiac NG JXI 400k BTU for spa - iAqualink PS8 w/ 4 relays - Jandy LED bubbler

  2. Back To Top    #2
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    8,585

    Re: Loss of CYA and CH

    Hey there BankOman

    Sorry to hear about the pool woes.

    Any chance you have had a leak? If you have an auto filler on your pool you could easily be unaware of a leak until your water bill came, or as you have discovered your chemical levels change. The only thing that gets rid of calcium and cya is water replacement, although sometimes cya degrades over winter but that's usually so minimal it doesn't cause a lot of problems. Or have you had to drain and replace water in the pool for any reason?

    It might be time for a bucket test --> Pool School - Leak Detection

    Yippee
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Skippy's Pool Cooler --> Skippy's New Fountain Our Build --> Our Pool Solved Our Sloping Yard

  3. Back To Top    #3

    Join Date
    Oct 2015
    Location
    North Richland Hills, Texas
    Posts
    191

    Re: Loss of CYA and CH

    I was thinking that however my water bill hasn't seen any increase. Next week I will do the bucket test to hopefully rule that out. We have some rain coming so not a reliable time to do the bucket test. And no replacement of water other than the normal auto fill.


    My Journey - 16x38 In-Ground gunite (14k gallons - 3.5-5-4) w/ Crystal Stones Smooth Tropical Isle - OK Flagstone coping - 693sqft spray deck decking - Jandy 580sqft Cartridge Filter - 2hp Jandy E Pump (VS) - Contracted Pool 4/22/16 - TF-100 Test Kit - 7x7 raised spa w/ rolled tile edge - Jandy nicheless LED lights (5) - Aqua Pure Salt Kit - Dolphin s300 robot - Zodiac NG JXI 400k BTU for spa - iAqualink PS8 w/ 4 relays - Jandy LED bubbler

  4. Back To Top    #4
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    8,585

    Re: Loss of CYA and CH

    Aha! so you do have an autofill. That's gotta be the explanation (in my mind) and you've got an occult leak someplace I bet.

    Go look around your equipment pad and the yard.... notice any wet spots you can't explain? Is there any way to turn the autofill off and give it a few days to watch for a loss?

    Yippee
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Skippy's Pool Cooler --> Skippy's New Fountain Our Build --> Our Pool Solved Our Sloping Yard

  5. Back To Top    #5

    Join Date
    Oct 2015
    Location
    North Richland Hills, Texas
    Posts
    191

    Re: Loss of CYA and CH

    Quote Originally Posted by YippeeSkippy View Post
    Aha! so you do have an autofill. That's gotta be the explanation (in my mind) and you've got an occult leak someplace I bet.

    Go look around your equipment pad and the yard.... notice any wet spots you can't explain? Is there any way to turn the autofill off and give it a few days to watch for a loss?

    Yippee
    I've checked around the equipment and don't see any water. Hard to notice with the yard since it's all synthetic grass.

    I can turn the auto fill off. Next week the weather should be better and no rain so I'll test it all then.

    In the meantime will having a lower than recommended CH for a plaster pool have any adverse effects?

    With the low CYA assuming I keep running my SWG at a higher % to keep FC up I should be fine in the meantime?

    Does my thought process on that sound right?

    Thanks for the help!


    My Journey - 16x38 In-Ground gunite (14k gallons - 3.5-5-4) w/ Crystal Stones Smooth Tropical Isle - OK Flagstone coping - 693sqft spray deck decking - Jandy 580sqft Cartridge Filter - 2hp Jandy E Pump (VS) - Contracted Pool 4/22/16 - TF-100 Test Kit - 7x7 raised spa w/ rolled tile edge - Jandy nicheless LED lights (5) - Aqua Pure Salt Kit - Dolphin s300 robot - Zodiac NG JXI 400k BTU for spa - iAqualink PS8 w/ 4 relays - Jandy LED bubbler

  6. Back To Top    #6

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,955

    Re: Loss of CYA and CH

    We have some rain coming so not a reliable time to do the bucket test.
    The rain doesn't matter. Bucket and pool are affected equally.

    CH of 275 is just fine. I would leave it alone as it will tend to rise slowly anyway.

    Yeah, you will most surely have to increase your FC % output.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

Posting Permissions

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