Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Why is chlrorine level so low even with LQ?

  1. Back To Top    #1

    Join Date
    Jun 2011
    Location
    Hampton Roads area, VA
    Posts
    56

    Why is chlrorine level so low even with LQ?

    Hi all,

    I installed the LQ a few weeks ago. All seemed to be fine for a while with the flow meter of the LQ set to 3ish (my FC would be about 4) but now when I test my water my chlrorine level is very low. Please see my numbers below:

    FC: .5
    CC: 0
    TC: .5
    pH: 7.8
    TA: 80
    CH: 60
    CYA: 20

    My thought is that with my CYA being so low the LQ can't keep up with the sun. But at the same time I don't understand why it's not keeping up considering the constant feeding it pumps out. Am I off base? Do I need to raise my CYA? Is there something else happening here?

    There's a couple of additional issues/questions I have that may or may not be related so I'm going to put it here just in case. If it belongs somewhere else please let me know and I'll repost it there. Read on.

    First: anyone have any other thoughts about the test results? I think my TA and CH are too low, but I'm getting conflicting information even from within the TFP site so I'd be grateful for any opinions. Also, I'm having a helluva time getting my pH to stay around 7.5. This may be related to the airation that I think is going on in my next issue.

    Next issue: About 2 weeks ago I made a terrible mistake by forgetting to put my multiport back on Filter after setting it Waste . It essentially ran for about 6 hours after it had drained enough water to drop it below the skimmer. I don't know if it's related, but it SEEMS as though since around that time I began noticing a significant amount of bubbles coming out of the return closest to the pump and the port used for the Polaris. Oddly, the return at the far end of the pool is behaving normally. What is going on?!?

    Thanks for the help.
    12.5K gal, Pentair Plus DE filter (FNSP48, 120gpm flow rate), IG, Vinyl, 1 HP WhisperFlo pump, Polaris 280 cleaning robot with booster pump

    Pool store!? We don't need no stinkin' pool store...

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Why is chlrorine level so low even with LQ?

    My guess is that you are correct about low CYA causing FC to disappear too fast. It didn't help that you emptied out a bunch of CYA by draining the pool. Raise it.

    TA will come down if you keep adjusting pH. pH rise will also slow down as TA gets lower. Deal with pH when it needs it and ignore TA.

    CH is fine for a vinyl pool. You don't need to worry about eroding the plaster

    I'd see if you have air trapped in the filter first. Then look for sources of air leaks, like the pump strainer gasket. If the pump got real hot running dry, you might have a drain plug that worked loose. Or an impeller seal that got worn. That one should be obvious - it will leak around the pump/motor junction, or maybe just squirt when the motor starts.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,334

    Re: Why is chlrorine level so low even with LQ?

    What Richard said
    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

  4. Back To Top    #4

    Join Date
    Jun 2011
    Location
    Hampton Roads area, VA
    Posts
    56

    Re: Why is chlrorine level so low even with LQ?

    Thanks to you both. Is there another way to check for air in the filter besides opening the release valve at the top? I have no evidence of leaks (water, at least) so I got that goin' for me.
    12.5K gal, Pentair Plus DE filter (FNSP48, 120gpm flow rate), IG, Vinyl, 1 HP WhisperFlo pump, Polaris 280 cleaning robot with booster pump

    Pool store!? We don't need no stinkin' pool store...

Posting Permissions

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