Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 12 of 12

Thread: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    Chicago, IL
    Posts
    11

    Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    Good morning !

    Recently moved in to a new house (well, new to me) and it has a pool. Went online to figure out how to take care of it. Think I'm on the right track but think I'm screwed from the previous owner. I've purchased a Taylor 2006 and am trying to use the BBB method. First test the night before the guys came out:

    Night of the Thursday 21st:
    FC: 0
    CC: 1
    PH: 7.4
    ALK: 130
    CYA: 100+ !!!

    But the water has been stagnant for probably 7 months. Was hoping CYA was high due to just being cloudy from "stuff"

    The guys came out to open the pool yesterday and to get everything un-winterized. The serviceman said he's been coming here for years and the previous owner was very meticulous about upkeep. Great ! I had already purchased bleach, borax, muriatic acid, baking soda, etc. I waited until the pumps were working before testing as the pool looked to be in good shape (though very cloudy). Added Liquid Chlorine to pool based on pool calculator. First test about an hour after pumps started and bleach added (morning of Friday 22nd):

    FC: 10
    CC: .5
    PH: 8
    ALK: 120
    CYA: 100+

    Then in the afternoon, the pump would stop after about an hour. Pressure would get high and think it would shut itself down (25ish PSI). Burping it got me about another hour. It is a Hayward Perflex DE filter and not knowing the last time since it had been rebuilt, decided to clean it out and start from scratch. Cleaned with muriatic acid and put back in to service late Friday 22nd. Let pump run about 1.5 hours and PSI was around 17 PSI. Thought I was now good so took another test (late Friday 22nd):

    FC: 1
    CC: 1
    PH: 7.8

    Add liquid chlorine to bring back up to shock (since off the chart, went with CYA of 150) water still cloudy since couldn't get extended run time on the filter. Still hoping that the pool being cloudy was making the CYA high.

    Woke up about 4 hours later just before day break.

    FC: 22.5
    CC: 1
    PH: 8.0+

    But at some point again, the filter stopped and looks like it was closer to when I went to bed than when I woke up. Didn't bother with CYA since you don't get that many tests in the Taylor 2006.

    So, appear to be in a holding pattern as I can't get the contaminants out. The PSI appears to get around 27 and it semi-shuts down the system. A burp gets me back well under 20 PSI.

    There is an auto-chlorinator which I'm not using (but assume is the reason why I have a high CYA from the previous owner).

    Should I assume that:
    I have a high CYA (and have to drain/refill at the same time (vinyl)
    Even though FC is high, it is not effective against algae (because of CYA)
    Filter "stopping" is because it is clearing out high amounts of algae

    Thanks for any input. Greatly appreciated!
    '91 Chicago-land Vinyl In-ground Pool: 41x16. 6' deep end / about 20,000 gallons. Hayward Perflex DE filter. Polaris Watermark G1000 Chlorinator (used by previous owner, not me). Hayward H200 Heater. Aux Pump for pressure side robot. (2) skimmers opposite of each other mid-pool, (1) bottom drain, (2) returns on opposite ends of pool lengthwise.

  2. Back To Top    #2
    poolnoob.ca's Avatar
    Join Date
    May 2014
    Location
    Georgetown, ON, Canada
    Posts
    277

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    Welcome Smokelawn, i'm sure others will be along later, but i can chime in to agree with your assumptions, and to suggest that to try to estimate CYA over 100, do a dilution of 1/2 pool water, with 1/2 tap water (which has 0 CYA by default). Then multiply the result of testing the diluted water by 2.

    p.s. and use PoolMath http://www.troublefreepool.com/calc.html to calculate how much muriatic acid you need to get your pH into the mid-7's. since you arent sure of your pool volume, add 1/2 the amount and see where that gets you, then add more if needed so that you don't overshoot the mark
    32,000L Fibreglass Leisure Pools IG 12.5'x23'x5' Pump: AstralPools BX1 1.0HP
    Filter: AstralPools ZX-310 SWCG: AstralPools VX7T
    Heater: Hayward H250FDN Test Kit: TF-100

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,085

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    Should I assume that:
    I have a high CYA (and have to drain/refill at the same time (vinyl)
    Even though FC is high, it is not effective against algae (because of CYA)
    Filter "stopping" is because it is clearing out high amounts of algae
    I agree all those premises are correct.

    Drain/refill first to get your pool to 40-50 ppm CYA.

    Next, SLAM the pool. Your target FC will be arounf 25 or so and then Hold that until your pool is crystal clear.

    Backwash that DE filter. I am not a DE filter expert, but I don't think the bump is adequate to clean your filter......backwash and recharge each time.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4
    Isaac-1's Avatar
    Join Date
    May 2010
    Location
    SW Louisiana
    Posts
    6,711

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    As chance would happen I just acid washed my Hayward Perflex EC75 yesterday as well, the good thing about DE filters is that they do a good job filtering out dead algae, of course that means bumping them every hour or so, and backwashing every few hours when the DE gets past the bump cleaning point. This is better than those with sand filters spending weeks clearing dead algae in my opinion though. As for what to do I would go ahead and tackle the high CYA, no sense fighting it all summer, now it the time to get it out of the way.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

  5. Back To Top    #5

    Join Date
    May 2015
    Location
    Chicago, IL
    Posts
    11

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    Quote Originally Posted by poolnoob.ca View Post
    Welcome Smokelawn, i'm sure others will be along later, but i can chime in to agree with your assumptions, and to suggest that to try to estimate CYA over 100, do a dilution of 1/2 pool water, with 1/2 tap water (which has 0 CYA by default). Then multiply the result of testing the diluted water by 2.

    p.s. and use PoolMath http://www.troublefreepool.com/calc.html to calculate how much muriatic acid you need to get your pH into the mid-7's. since you arent sure of your pool volume, add 1/2 the amount and see where that gets you, then add more if needed so that you don't overshoot the mark
    Everyone, thank you for the responses. As I feared, it sounds like I will need to drain a portion of the pool. @Poolnoob.ca, great suggestion with 50/50% solution to figure out an accurate level. CYA ended up being around 140.

    Went to the dreaded Leslie's to look up if they had CYA regent to replace for Taylor's 2006 kit. I came across this product. It has high reviews. Can anyone comment on it before I start the dumping process??
    http://www.lesliespool.com/bio-activ...cya%2520regent

    Once again, greatly appreciated. Thank you for your time.
    '91 Chicago-land Vinyl In-ground Pool: 41x16. 6' deep end / about 20,000 gallons. Hayward Perflex DE filter. Polaris Watermark G1000 Chlorinator (used by previous owner, not me). Hayward H200 Heater. Aux Pump for pressure side robot. (2) skimmers opposite of each other mid-pool, (1) bottom drain, (2) returns on opposite ends of pool lengthwise.

  6. Back To Top    #6

    TFP Guide

    Azgirl71's Avatar
    Join Date
    Apr 2015
    Location
    Sierra Vista, Az
    Posts
    2,586

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    You have been given great advice in regard to CYA. I wanted to add that when your FC is 10+ there is no reason to test PH. The test is not accurate above 10FC
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

  7. Back To Top    #7
    Isaac-1's Avatar
    Join Date
    May 2010
    Location
    SW Louisiana
    Posts
    6,711

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    There are several ongoing threads about Bioactive, it s a new product, and so far results from people testing it have been less than stellar, look in the deep end section of the forum for these threads. In general if it does anything at all results tend to be maybe a 20 ppm reduction in 100+ ppm CYA levels which is within the margin of error of the test.

    p.s. here is one of the threads on the topic http://www.troublefreepool.com/threa...-Reducer-trial there are others doing testing too like http://www.troublefreepool.com/threa...ve-CYA-reducer or http://www.troublefreepool.com/threa...-reducer-trial
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

  8. Back To Top    #8

    Join Date
    May 2015
    Location
    Chicago, IL
    Posts
    11

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    UPDATE: never purchased any BioActive. Continued to run filter. I drained about a foot while refilling. Let it refill to normal height. Drained again about a foot while refilling. Refilled to normal height. Took these results this morning:
    FC: .5
    CC: 0
    Ph: 7.0 (since low chlorine)
    For CYA, I did half pool water and half tap water. Added regent. Clear all the way to the top. No loss of dot at all. So, since using half tap, 0x2 = 0 CYA.

    Does this make sense? I know, trust the results. But do these results make sense?

    Thanks again for any input!
    '91 Chicago-land Vinyl In-ground Pool: 41x16. 6' deep end / about 20,000 gallons. Hayward Perflex DE filter. Polaris Watermark G1000 Chlorinator (used by previous owner, not me). Hayward H200 Heater. Aux Pump for pressure side robot. (2) skimmers opposite of each other mid-pool, (1) bottom drain, (2) returns on opposite ends of pool lengthwise.

  9. Back To Top    #9
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,999

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    Low chlorine has no impact on PH level. Chlorine level above 10 makes the PH test invalid. Yes, it is possible that bacteria consumed your CYA.

    Time to SLAM - Shock Level And Maintain the pool.
    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

  10. Back To Top    #10
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    Run the Cya test again with no dilution. If you have low Cya, you don't want a diluted test. Something isn't adding up here. Your Cya was 100 plus before and you've not drained the pool 100%.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  11. Back To Top    #11

    Join Date
    May 2015
    Location
    Chicago, IL
    Posts
    11

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    Ran CYA test from other end of the pool at full strength. CYA was at 40. Not sure of the accuracy of the "dot test" ... I mean I can very slightly see the dot at about 50 and it officially disappears at 40. I'll have to do another test to compare the results but it seems as the drain/refill was very very effective. Hopefully time to move on to SLAM ?
    '91 Chicago-land Vinyl In-ground Pool: 41x16. 6' deep end / about 20,000 gallons. Hayward Perflex DE filter. Polaris Watermark G1000 Chlorinator (used by previous owner, not me). Hayward H200 Heater. Aux Pump for pressure side robot. (2) skimmers opposite of each other mid-pool, (1) bottom drain, (2) returns on opposite ends of pool lengthwise.

  12. Back To Top    #12
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,999

    Re: Believe CYA is high. Hayward DE pumps goes to high pressure after hour

    Yep, SLAM away.
    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

Posting Permissions

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