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Thread: I'm going back to the pucks!

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    I'm going back to the pucks!

    Hehe well sort of.

    So my pool was a disaster last year with a CYA over 200 all all sorts of issues. Right in the midst of all that, my Hayward chlorinator got gummed up and quit working. So I changed that out to a Pentair myself late in the season, and around the same time discovered the TFPC method and changed over to that this year. So I did a partial drain and refill and got the CYA down to 40 for the start of the season (it was 80 when I closed but that's another subject...)

    So this year things are going well. I just checked my numbers (Taylor 2006), and here they are:

    Gallons: 20000
    FC: 5
    CC: 0
    CYA: 35
    pH: 7.8
    TA: 80
    CH: 50

    The water is crystal clear. So I used to fight with acidic pH, and now it slowly floats up. It will float up to 7.9/8.0 and I'll have to do dry acid every few weeks or so, quite manageable. My plan is to run Trichlor only when I'm traveling for work, which is occasional. However, I've never actually run the Pentair for very long, so I don't even know where to set it to. I know my daily chlorine demand averages right at 2 ppm. So my plan is to run the chlorinator for 1 week with no liquid bleach to accomplish the following:

    1) Find a decent chlorinator setting that will maintain chlorine for a week. Heck, find out if the thing even works.
    2) Bump my CYA back up to 43 (35 + 2 ppm * 7 days * .6 ppm). My pool gets no shade and has a light swimmer load. I feel 35 might be a tad low, if I could get my chlorine demand down to 1.5 ppm / day that would be great.
    3) Pull the pH back down

    Hopefully this is a good plan. I think it's easier to adjust a chlorinator when everything is dialed in already with no excessive chlorine demand issues going on.

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    Re: I'm going back to the pucks!

    That IS a good plan. TFP is all about understanding how to MANAGE your pool water (not letting the part-time help at the pool store manage it) and that is exactly what you are doing.......testing and knowing what to do with the test results. Very nice work.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: I'm going back to the pucks!

    +1 TFPerfect
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: I'm going back to the pucks!

    Cool, thanks for the confirmation.

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    Re: I'm going back to the pucks!

    Scary thread title!
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

  6. Back To Top    #6

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    Re: I'm going back to the pucks!

    Yeah I was having a little fun with it. No worries.

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    Re: I'm going back to the pucks!

    Nothing wrong with pucks in a seasonal pool...TFP is about understanding your pool...
    21,100 IG Vinyl
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    Taylor K-2006 Kit

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    Re: I'm going back to the pucks!

    OK so after 10 days of the trichlor experiment, I have my results:

    FC: 5
    CC: 0
    CYA: 35
    pH: 7.3
    TA: 60

    I tried to measure the CYA as accurately as possible, going back and forth with the comparator and dispensing bottle a few times. It seems to still be right at 35, and didn't budge since the start of the test. This is a disappointing result. I used 6 pucks total (8 oz each), which should equal 10 ppm CYA rise for my pool. I know it is difficult to measure CYA accurately, but this should have moved the needle. Hmm.

    EDIT: Also, the pool was not refilled or backwashed during the test.

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    Re: I'm going back to the pucks!

    Where did you get your pucks from? I got some from Sam's Club and they barely raised my CYA level. I have approximately 23,000 gallon plaster pool and CYA level was 30. After adding about 10-15 lbs of pucks, my CYA level only went up by 10. Pool math shows it should have gone up by at least 30.
    23,000 inground gunite, 38 x 21 free form, Pebble Sheen Prisim Blue pool and spa, Jandy PDA-PS8, Jandy DEV 60, Jandy Stealth 2.5 HP 2 Speed, Jandy Stealth 2 HP for water features (1 bubbler and 3 scheer descents), Jandy LXI 400K BTU, Zodiac iAquaLink 2.0, Polaris 3900 Sport, 700+ sq ft travertine decking

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    Re: I'm going back to the pucks!

    don't forget, it takes a week for the CYA to show. After it has gone into the pool.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: I'm going back to the pucks!

    They are Aqua Chem Tabs Plus (3" x 8 oz). Since they eroded at nearly the exact rate predicted necessary to dispense 2 ppm FC per day, I can rule out "bad pucks". Unless these are magic "low CYA" pucks. Wouldn't that be nice.

    - - - Updated - - -

    Quote Originally Posted by pabeader View Post
    don't forget, it takes a week for the CYA to show. After it has gone into the pool.
    Is that really true in this case? I'm aware of that for solid stabilizer granules that take a while to dissolve. I wouldn't expect there's a bunch of undissolved CYA in my pool after running pucks for 10 days though.

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    Re: I'm going back to the pucks!

    Quote Originally Posted by pabeader View Post
    scary thread title!
    click bait!
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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    Re: I'm going back to the pucks!

    I do the same thing whenever my CYA drops to 30. With our torrential tropical rains, I have lost 40 CYA this season already just from draining to waste extra water. I really find maintaing my pools fc is easiest at a cya of 60, and I don't have a swg. Mine is using pucks this week too.
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

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    Re: I'm going back to the pucks!

    Well I'm back on the bleach, but maybe I need another week with the pucks.

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    Re: I'm going back to the pucks!

    Quote Originally Posted by pabeader View Post
    don't forget, it takes a week for the CYA to show. After it has gone into the pool.
    That's only when you add pure CYA through the skimmer to get caught in the filter because then it takes a lot longer to dissolve, especially in oversized cartridge filters. CYA added from Dichlor, Trichlor, or liquid CYA (sodium cyanurate) should register almost immediately after mixing in the water though with pure CYA if you use too coarse a sock, panty-hose, or T-shirt then granules could fall through away from a return or skimmer flow and those granules will take longer to dissolve.

    I've used Trichlor pucks to slowly raise the CYA and it measures as expected though it's easier to see a 20 ppm change than a 10 ppm change. Of course if one has water dilution then one won't see much change.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: I'm going back to the pucks!

    Out of curiosity, what was the setting that you used on the Hayward chlorinator to add 2ppm? I have a pool size/ chlorine demand similar to yours, and at some point I will need to us my Hayward chlorinator for going out of town, and I have no idea what setting I would need....I'm just looking for a starting point and tweak it from there.
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

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    Re: I'm going back to the pucks!

    Quote Originally Posted by 440dodge440 View Post
    Out of curiosity, what was the setting that you used on the Hayward chlorinator to add 2ppm? I have a pool size/ chlorine demand similar to yours, and at some point I will need to us my Hayward chlorinator for going out of town, and I have no idea what setting I would need....I'm just looking for a starting point and tweak it from there.
    The 3.75 setting seemed to do the trick. I assume yours is bottom fed, the same as mine. All bets are off with the top-fed installation.

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    Re: I'm going back to the pucks!

    Thanks! Mine is bottom fed as well
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

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