Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 11 of 11

Thread: Green murky water and low CYA

  1. Back To Top    #1

    Join Date
    Jul 2011
    Location
    Abington, PA
    Posts
    3

    Green murky water and low CYA

    Please help. I've been reading for more than an hour and haven't found the answer to my specific problem. First let me say that I have an natural unfinished gunite/concrete (not sure if there is a difference in those 2 terms but in the 3 years I've owned this house I've heard both being used to describe my pool), IG pool which is surrounded by trees. Even when it is crystal clear it appears green. I've always assumed it was the fact that there is no finish to the pool floor and the water refelcts the green surroundings.

    For the past week I have had green cloudy water, can't see the bottom on the deep end. My results as of a few hours ago are:
    FC 1, TC 1, pH 7.2, TA 110, CH 250, CYA 20.

    I know that the CYA being low will affect the chlorine so I think I need to do something about that before I dump in a gall or two of liquid chlorine. Please advise on whether or not I should be bringing up the CYA before shocking? Also, I'm a bit concerned about the pH, although it's in range I think it's a bit low. Thoughts?

    I so appreciate any advice. Thanks

    [attachment=0:2x0zv528]IMG009[1].jpg[/attachment:2x0zv528]
    Attached Images Attached Images
    Be blessed and enjoy life!
    11k, Pentair FNS Plus 36 DE filter, IG gunite/concrete, 1 HP pump

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Green murky water and low CYA

    Don't worry about the PH. It will probably come up very slowly on it's own.

    I would start adding a little more CYA and start shocking at about the same time. Either one can come first, there is no need to wait for the other. If you haven't already, take a look at the instructions on shocking your pool in Pool School.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    8,998

    Re: Green murky water and low CYA

    You can also bring it up to shock level for your cya of 20..........add cya to the level you want.................wait 24 hours............and raise the shock value to match the new cya level (which won't show up on testing for a while yet). Couple of points over won't hurt either.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  4. Back To Top    #4

    Join Date
    Jul 2011
    Location
    Abington, PA
    Posts
    3

    Re: Green murky water and low CYA

    Pool is not much improved at all. Went back to the pool store today for a water check. The guy who tested my water yesterday was fired this morning. He apparently had my results all wrong. After putting a sock of conditioner in the skimmer and 1.5 gallons of liquid chlorine in last night about 8PM my results are as follows:
    FC 2, TC 2, pH 7.0, CYA 0, CH 250.

    The Pool store sold me Yellow out and said to bring up my pH to 7.8 - 8 with 4lbs of soda ash, wait 4 hours then dump in 2 lbs of yellow out, wait 5 mins then shock the heck out of it (4 lbs of powder or 4 gal of liquid).

    Good advice? Or should I just wait and call the pool service on Monday! I'm at my wits end...sigh.
    Be blessed and enjoy life!
    11k, Pentair FNS Plus 36 DE filter, IG gunite/concrete, 1 HP pump

  5. Back To Top    #5
    pepsiholic's Avatar
    Join Date
    May 2009
    Location
    Fairmont, WV
    Posts
    362

    Re: Green murky water and low CYA

    Shock is a process, not a one time dose. You need to get your chlorine up to shock level for your cya and keep it there until the pool starts to clear. That may entail adding chlorine or bleach every hour. Read Pool School how to shock your pool. You really need a good test kit (like TFTest kit). If you learn to take control of your water and do it yourself, you will never need "pool store" avice again.

    It may seem a little overwhelming at first, but I've been using this method for 2 years now and have never had algae (other than opening), and it was cleared in just a few days. And believe me IF I can do it, anyone can! =)
    24 x 52 Round AG Outback Empire Pool 13,500 gal.
    1 HP Hayward Power-Flo pump w/Hayward 18" 150lb. sand filter
    TF-100 test kit & SpeedStir
    Wanda the Whale Vacuum

  6. Back To Top    #6
    frogabog's Avatar
    Join Date
    Jul 2010
    Location
    Portland, Oregon
    Posts
    1,578

    Re: Green murky water and low CYA

    Oh, please don't raise PH and put yellow stuff in the pool. Save it, get your money back. Read about shocking, get a good test kit and stop talking to pool store. PH of 7.2 is ok for shocking, after you're done you can raise it a tad to 7.4'ish when you're ready to swim.

    I don't see how it's possible there's no CC with it that green and cloudy considering you haven't shocked it yet.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

  7. Back To Top    #7

    Join Date
    Jul 2011
    Location
    Abington, PA
    Posts
    3

    Re: Green murky water and low CYA

    OK, I have a bit of success after a long weekend. I can see the bottom of the pool clearly, even at the deep end. Thank you, thank you, thank you. So glad I found this site. Couple more questions:

    I've been running the filter for about 3 days now, when can I go back to the regular 10 hours?
    I switched to bleach (6%) last night after using chlorine (12.5%) and noticed some sudsy bubbles when I pulled the solar cover back and I can still smell the bleach. Is this to be expected?
    I think I read that I don't need to use and algaecide. Is this correct? If not, shall I put one in now since the water is clear?

    Here is a pic of the pool as of this morning. May not look like much to those with blue floors but for me and my natural concrete finish I'm feeling pretty good.

    [attachment=1:2ba2xikv]IMG015.jpg[/attachment:2ba2xikv] [attachment=0:2ba2xikv]IMG018.jpg[/attachment:2ba2xikv]
    Attached Images Attached Images
    Be blessed and enjoy life!
    11k, Pentair FNS Plus 36 DE filter, IG gunite/concrete, 1 HP pump

  8. Back To Top    #8

    Join Date
    Aug 2010
    Location
    Dallas, TX
    Posts
    4,052

    Re: Green murky water and low CYA

    The bleach is your algaecide. You don't need anything from the pool store.

    Keep going on the shock process, and keep your pump running until the shock process is complete.

    The bubbles are a normal part of the shock process killing the algae. The bleach smell is from chlorimine. It's also a normal part of the shock process. Once your pool is rid of the algae, the smell will go away.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

  9. Back To Top    #9
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Green murky water and low CYA

    Make sure the bleach you used was regular unscented bleach. You don't want to use any of the specialty bleaches (splashless, scented, outdoor, etc.) in your pool.
    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

  10. Back To Top    #10

    Join Date
    May 2011
    Location
    Clearwater, FL.
    Posts
    446

    Re: Green murky water and low CYA

    Hi and welcome to TFP!
    Now with all the $$ your saving by not spending $$ in the pool store, order your TF-100 test kit and this will allow you to be the boss of your pool.
    Without one, your not in control at ALL times, this can be your downfall and not win against this pool.

    Chuck
    Link for TF kit: http://tftestkits.net/splash-page.html
    Swim n Play 21' round, expandable 72" liner, 6FT deep center, buried 14", 12,750 Gallons
    Waterway 1HP-2 speed with 22" Sand filter
    TF-100 test kit
    Thanks to TFP my pool is perfect all the time :party:
    I now suffer from Sparklypoolitis! :whoot:
    I am a Platinum contributor because I want everyone who comes here to Trouble Free Pool to have the same success that I enjoy with my pool and family.

  11. Back To Top    #11

    Re: Green murky water and low CYA

    Also it is important to leave the solar cover off while shocking. This will allow the cc to be burned off by the sun.

    22,200 Gallon Rectangle IG - Vinyl Liner w/ Jacuzzi Lazer Sand Filter

Posting Permissions

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