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Thread: CH borderline

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    CH borderline

    Just took my readings and everything seems to be in line with recommended levels other than CH...

    FC - 3.0
    CYA - 30
    PH - 7.4 ish
    TA - 90
    CH - 390 - 400

    So how concerned should I be with CH at 390 - 400? To get to 300, I'd have to replace 25% of my water. Would prefer not to go through that hassle or expense if its not a huge deal.
    35'x16' IG geometric with 8'x6' spa (16.5K gallons); White Diamond Pebblesheen w/Abalone Shells; Jandy 460 cartridge filter; Jandy 2HP E pump; Jandy 400K heater; Water Tech Blue Diamond Pro; TF-100 w/SpeedStir

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    Mod Squad Bama Rambler's Avatar
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    Re: CH borderline

    A CH of 400 isn't bad at all as long as you keep the pH in check. What is the CH of your fill water?
    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

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    Re: CH borderline

    What? Check the CH of my fill water? Now that would just be too logical! I'll check.
    35'x16' IG geometric with 8'x6' spa (16.5K gallons); White Diamond Pebblesheen w/Abalone Shells; Jandy 460 cartridge filter; Jandy 2HP E pump; Jandy 400K heater; Water Tech Blue Diamond Pro; TF-100 w/SpeedStir

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    Re: CH borderline

    I just tested it. I'm only 3-4 weeks into this pool ownership thing so still trying to get a feel for the test kit. It's much easier to tell when the pool water sample turns from red to blue as its a more defined change. My outside tap water looked to have a CH of around 150 - 180.
    35'x16' IG geometric with 8'x6' spa (16.5K gallons); White Diamond Pebblesheen w/Abalone Shells; Jandy 460 cartridge filter; Jandy 2HP E pump; Jandy 400K heater; Water Tech Blue Diamond Pro; TF-100 w/SpeedStir

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    Mod Squad Bama Rambler's Avatar
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    Re: CH borderline

    I asked what the CH of the fill water was because if you're thinking about draining and replacing water and your fill water CH was high you wouldn't be helping yourself any. Since it's that low you can drain and refill and the CH in the pool will go down some. But, like I said, at 400 ppm it isnt' high enough to be a real problem. Just keep the pH toward the lower end of the range and you'll be fine.
    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

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    Re: CH borderline

    Thanks, I figured that was the case on why I should test fill water. CH should probably come down over time given I live in TX and I'll see a decent amount of evaporation during the hot months.
    35'x16' IG geometric with 8'x6' spa (16.5K gallons); White Diamond Pebblesheen w/Abalone Shells; Jandy 460 cartridge filter; Jandy 2HP E pump; Jandy 400K heater; Water Tech Blue Diamond Pro; TF-100 w/SpeedStir

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    Re: CH borderline

    CH should probably come down over time given I live in TX and I'll see a decent amount of evaporation during the hot months.
    Unfortunately, that won't be the case. CH is not affected by evaporation and it, under most all circumstances, will slowly continue to increase.

    Very similar to CYA, the only way to reduce CH is to drain off some of the pool water and replace it with your lower CH fill water.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CH borderline

    Dave, with evaporation comes water replacement!
    35'x16' IG geometric with 8'x6' spa (16.5K gallons); White Diamond Pebblesheen w/Abalone Shells; Jandy 460 cartridge filter; Jandy 2HP E pump; Jandy 400K heater; Water Tech Blue Diamond Pro; TF-100 w/SpeedStir

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    Re: CH borderline

    Yes, but the existing CH in your pool doesn't evaporate....it concentrates. Therefore, any fill water you add that contains ANY CH, only adds to the existing total.

    Many newbies don't get that at first because it's somewhat counter-intuitive but, believe me, that's what happens.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CH borderline

    They speak the truth. Like most people in Houston my fill water is high in CH (mine is CH 150) and I'm currently at CH 575. To balance the numbers I keep my TA down to 70 or below and I keep my pH in check. Draining and replacing water quickly got old. But with high CH fill water and drought conditions its either drain and fill or keep the TA and pH in check.

    Edit: I also added borates and I believe it helps with the CSI.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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    Re: CH borderline

    Duh! I should have known that CH (as well as CYA, correct?) doesn't "evaporate" with the water! Hmmm, maybe some heavy rain might dilute it some? Either way, I'll have to monitor it and a dump/refill may be in my future if it goes any higher.
    35'x16' IG geometric with 8'x6' spa (16.5K gallons); White Diamond Pebblesheen w/Abalone Shells; Jandy 460 cartridge filter; Jandy 2HP E pump; Jandy 400K heater; Water Tech Blue Diamond Pro; TF-100 w/SpeedStir

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    Mod Squad Bama Rambler's Avatar
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    Re: CH borderline

    To make an course example of it. Say your CH in the pool is 400 and the CH of the fill water is 200. Now say that 10% of your water evaporates. Now your CH in the pool is 440. You add the 10% back in fill water to the pool and your CH now goes back to 400 PLUS 20 ppm that the fill water adds. Now you have a CH of 420 ppm instead of 400 ppm.

    Take the same scenario except you drain off the water instead of letting it evaporate. You drain 10% of the water. Now your CH is still 400 in the pool. You refill the pool with the fill water so the pool is now at 360, BUT, you have to add the CH that the fill water adds, so you're actually at 380. In that case you've actually lowered your CH a bit.
    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

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    Re: CH borderline

    I'm not sure if you have a substantial rainy period where you live (like I do), but when my pool gets flooded to the point that the skimmer no longer functions, I drain a few inches off (actually use the pumps to discharge water through a hose bibb that is connected to the filter output plumbing).

    Now that will remove some of the CH (and dilute it slightly too). It takes out a little of just about everything else too.
    John (DIYer). Concrete, approximately 13,000 gallon in-ground pool with adjoining concrete spa. Approximately 40 years old. Hayward Super II pump for pool and legacy Anthony Sta-Rite bronze pump CF6 for spa, VA-26 filter,(2 sets), Rheem propane heater for spa. HASA Liquidator for pool.

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