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

Thread: Ready to drain the thing.

  1. Back To Top    #1

    Join Date
    Jul 2016
    Location
    Cincinnati
    Posts
    5

    Ready to drain the thing.

    Current numbers:
    pH 7.4
    FC 20 (average)
    CC .5
    TA 130
    CYA 50

    I've been slamming my pool for over a week now. Started vacuuming to waste yesterday and today. There is still algae of some sort on the bottom and a few inches up the side every morning. I have been brushing daily as well as vacuuming. The algae was going right through the Intex cartridge filter when I vacuumed so I started vacuuming to waste yesterday. This has improved things noticeably but it was still there this morning. The water is not as cloudy though. But there was still visible algae this morning.

    Today is the second day of vacuuming to waste. I will check it again in the morning.

    I am thinking of draining it and re-filling. It's 10K gallons, vinyl. Maybe I need to get a decent DE Filter. They filter down to 1 micron or so right? Would a DE filter get the algae out?

    I have the TF-100 Test Kit.

    I appreciate all input!

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,200

    Re: Ready to drain the thing.

    Hi, welcome to TFP! If what you are seeing is still green then you are still killing algae. A DE (or sand, or a better cartridge filter) will clean up the dead algae better than your current filter, as long as it is sized appropriately, however until all the algae is dead you need to keep slamming. Since you are seeing a noticeable improvement that is a very good sign the slam will be completed soon.
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  3. Back To Top    #3
    needsajet's Avatar
    Join Date
    Jan 2016
    Location
    Sydney, NSW, Australia
    Posts
    3,555

    Re: Ready to drain the thing.

    Welcome to TFP! Good to have you here

    Keep it going, you're almost there. Do the cartridges look OK, i.e. no holes or anything?

    Draining vs. slamming is mostly about replacement water and chemical cost (assuming the pool is all above-ground). It's also fair to say you won't suck every bit of the dead "dust" out with draining, so you'd probably need to mop it out as well.

    Here's info on filters: Pool School - Pool Filter Comparison

    Please add a signature to get the best possible advice. Instructions are in "Read Before Posting" which is linked in my signature, thanks.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Ready to drain the thing.

    Intex filters are notorious for not enough capacity.

    Replacing that filter is your best bet.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5

    Join Date
    Jul 2016
    Location
    Cincinnati
    Posts
    5

    Re: Ready to drain the thing.

    today's numbers:

    pH 7.3
    FC 22
    CC .5
    TA 110
    CYA 50

    Thanks for all the input folks!

    I think I've turned the corner on the algae problem. This morning was the cleanest I've seen it in weeks. Very little algae on the bottom. Just barely noticeable when comparing to a freshly brushed section. The water looks quite clear now but I will continue to slam until I see no algae and I have minimal overnight FC drop.

    My filter cartridge is in good shape, no holes. I replace them fairly often, and rinse them with a hose everyday. Still, a DE filter or a better cartridge filter is in the works for next year.

    The algae problem began because my CYA level was low, about 10, and I was having a hard time keeping the FC level up in this hot weather and with all the swimming. I tried the powdered cyanuric acid initially, (this is my first year with a pool) putting in well over 3 pounds of it, trying to dissolve it first in a bucket, but it would not bring the CYA level up to more than a 10. It may have been a bad batch or something. When I put in the liquid cyanuric acid the CYA level came on target immediately. No more powder for me!

    The vacuuming to waste may have been the key to turning the corner on this. I will do it one more time today.

    Thanks again.
    Last edited by brassman96; 08-10-2016 at 02:35 PM. Reason: math error
    Intex 22' 10K above ground vinyl pool, Intex Pump and Cartridge filter, opened 06/16
    TF-100 Test Kit
    Cincinnati, Ohio

  6. Back To Top    #6

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: Ready to drain the thing.

    to TFP brassman96

    Most of the time all you need is patience. That said I know I'm really short on having any even when I'm doing my own pool !! Glad to hear you're seeing some light at the end of the tunnel.
    Better (bigger) filter would likely help next time.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

  7. Back To Top    #7
    needsajet's Avatar
    Join Date
    Jan 2016
    Location
    Sydney, NSW, Australia
    Posts
    3,555

    Re: Ready to drain the thing.

    While you're SLAMing, only test FC and occasionally CC so you know what's happening. pH is not accurate above 10 ppm FC anyway.

    Keep the SLAM going to the bitter end; you're nearly there.

    Liquid stabilizer is handy, for sure. Note that powdered CYA will not show up in testing for a few days after adding it.

    MMMaintain and BBBrush! Good luck with the last of the dust.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

  8. Back To Top    #8

    Join Date
    Jul 2016
    Location
    Cincinnati
    Posts
    5

    Re: Ready to drain the thing.

    Thanks for the encouragement folks, I needed it. Next year I will be EXTRA careful to get my CYA up right away and keep the FC on target. I want no more battles with algae. It is a formidable foe!
    Intex 22' 10K above ground vinyl pool, Intex Pump and Cartridge filter, opened 06/16
    TF-100 Test Kit
    Cincinnati, Ohio

  9. Back To Top    #9

    Join Date
    Jul 2016
    Location
    Cincinnati
    Posts
    5

    Re: Ready to drain the thing.

    Patience and persistence have paid off! It took about 12 days of slamming. The water is clear, no visible algae. I can't do the overnight chlorine drop test until I receive more R-0871. I ran out from doing so many tests! But I think I'm finally done slamming.

    At what FC level can we swim again? Anywhere below 10? FC is dropping but is around 12 ppm. CYA is 40 now from all the rain and draining of excess water.

    Thanks for the advice folks!
    Intex 22' 10K above ground vinyl pool, Intex Pump and Cartridge filter, opened 06/16
    TF-100 Test Kit
    Cincinnati, Ohio

  10. Back To Top    #10


    TFP Guide
    jeffchap's Avatar
    Join Date
    Jun 2012
    Location
    Edmond OK
    Posts
    1,373

    Re: Ready to drain the thing.

    With CYA at 40, you can swim with FC at 16 or below.
    25000 gallon free-form gunite
    Jandy Stealth pump/CL340 cartridge filter
    Pentair IC40 SWG
    Pentair MasterTemp 250HD heater
    Jandy AquaLink RS automation

  11. Back To Top    #11
    needsajet's Avatar
    Join Date
    Jan 2016
    Location
    Sydney, NSW, Australia
    Posts
    3,555

    Re: Ready to drain the thing.

    Great news! Well done

    +1 to Jeffchap's answer above. We like to keep our pools safe for swimming so TFPC methods pretty much revolve around that principle.

    Safe swimming rules are:
    Bottom of the pool entirely visible
    pH between 7.2 and 7.8
    FC between minimum and shock level per: Pool School - Chlorine / CYA Chart
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

  12. Back To Top    #12

    Join Date
    Jul 2016
    Location
    Cincinnati
    Posts
    5

    Re: Ready to drain the thing.

    Thanks for the very clear responses! It's back to the water!
    Intex 22' 10K above ground vinyl pool, Intex Pump and Cartridge filter, opened 06/16
    TF-100 Test Kit
    Cincinnati, Ohio

Posting Permissions

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