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Thread: Stubborn Yellow Algae

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    Stubborn Yellow Algae

    Hello, I'm new to this site and am happy to have found it. We purchased our house 2 years ago with an existing pool and have had trouble from day 1. We are previous pool owners (10 years) and never had problems so this has been frustrating .

    We had the same algae problem last summer so after following the recommendations of our local pool store several times with no luck we decided to have the pool drained and acid-washed. Once that was completed I purchased the Taylor K-2006 kit to make sure all chemicals were kept in check. I've noticed the pH goes up quickly on this pool and I'm constantly adding acid to keep it closer to 7.5-7.6. I brush constantly but have been getting the yellow spots in the deep end on the wall and steps. I tried raising the FC to keep it near 5 in order to try and control the yellow algae but every day I go out and see new spots. I use a floater for the chlorine tabs and keep it wide open and I've also added dichlor to raise the FC. I added 8 oz of Yellow Out several days ago and then raised the chlorine again. After reading a bunch of posts I'm guessing you're all cringing with the mention of the yellow out and tabs! The water is pretty clear and I wouldn't describe it as cloudy. There is very little debris that gets into the pool and I cleaned the filters on May 5th.

    The pool is approximately 20K gallons, in-ground plaster, with a new Pentair Intelliflo VS 3hp pump running 8 hours (4 hrs @ 2800 rpm and 4 hrs @ 1500 rpm). There is a waterfall feature, Hayward sweeper and Hayward SwimClear Cartridge Filter.

    Thank you!

    20K gallon in-ground plaster, Pentair Intelliflo VS 3hp pump, Hayward Sweeper and Swimclear Cartridge Filter, waterfall feature

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    Texas Splash's Avatar
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    Re: Stubborn Yellow Algae

    Welcome LVChris. I'm a Vegas native myself (Rancho Class of '81). TFP can help you for sure. Great have a good test kit and know how to use it. Here's a few quick pointers before others chime-in:
    - Stay out of the pool store for advice or products; waste of time
    - Algae simply means you need to use the TFP "SLAM" procedure (linked below) which focuses on maintaining the appropriate level of FC based on your CYA level
    - Do not use any more "bags of shock" or tablets as the pool store may advise; you will use regular liquid bleach when using the SLAM method.

    The links below in my sig speak more clearly of all of this and will help get you on track. More to follow. Welcome!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Stubborn Yellow Algae

    Thank you Texas Splash - Chaparral Class of '78!

    I've seen a lot about the TFP SLAM but haven't seen anything about how much bleach I should have on hand before I start this process. Living in LV it seems risky to remove the chlorine float (old habits die hard) but once I get started on this I'm sure everything will be fine.

    I forgot to mention that today's tests showed: ph=7.6, TA=100, FC=4.5. I haven't checked the CYA in months because I only had enough for one more test and haven't re-ordered and wanted to make sure I gathered as much information as possible before doing the test. I will do a little more reading - thanks again!
    Chris
    22K gal, IG Plaster w/waterfall, Pentair Intelliflo VS 3hp
    Hayward Cleaner & Filter Cartridge

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    Texas Splash's Avatar
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    Re: Stubborn Yellow Algae

    Small world huh? Not to worry about the water and TFP - it will work. Just need to stay committed and be a little patient, and as you stated ... break some old habits. Pool store habits are the toughest to break, but you're armed with a good test kit, so you should be fine. Many of us have done a SLAM before, and you can too. The bleach works great and has next to no residual effects on your pool or other chemicals. Make sure you reference my links below to ensure you are using the right amount of liquid bleach required to maintain the proper FC level for your pool based on the current CYA (see Chlorine/CYA chart). You need to know your current CYA for sure. Once you know your current CYA, you can use the Poomath Calculator link below to enter your "NOW" and "TARGET" figures for FC and CYA. The calculator will tell you how much bleach to put in, as well as stabilizer if your CYA was too low. If your CYA is really too high because you've been using pucks and pool store bags of shock for a long time, let us know and we'll re-address and go from there. The links below help to show you want those numbers should be. If you get stuck, let us know.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Mod Squad jblizzle's Avatar
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    Re: Stubborn Yellow Algae

    Welcome to TFP!!

    Really need to know the CYA level to know how to proceed. Have you ordered CYA refills yet? Should have months ago
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: Stubborn Yellow Algae

    Thanks. I am reading everything now

    - - - Updated - - -

    You are correct! I have enough for one test so I'll go out and do that now and order more tonight! Thank you!
    Chris
    22K gal, IG Plaster w/waterfall, Pentair Intelliflo VS 3hp
    Hayward Cleaner & Filter Cartridge

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    Mod Squad jblizzle's Avatar
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    Re: Stubborn Yellow Algae

    You should likely order more FAS-DPD reagent too.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Stubborn Yellow Algae

    I'm not sure if I'm replying correctly so please feel free to comment .

    Just checked the CYA level and it is above 100!

    What is FAS-DPD reagent? - Nevermind - found it-powder to test Cl level.

    Thanks!

    - - - Updated - - -

    It looks like I need to do a partial drain and refill. I'm guessing this will need to be done every year since we completely drained the pool last May.
    Chris
    22K gal, IG Plaster w/waterfall, Pentair Intelliflo VS 3hp
    Hayward Cleaner & Filter Cartridge

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    Mod Squad jblizzle's Avatar
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    Re: Stubborn Yellow Algae

    You will not have to do this if you stop using the chlorine tablets ... this is exactly why we do not recommend them.

    Have you discovered Pool School yet? Start with these:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Texas Splash's Avatar
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    Re: Stubborn Yellow Algae

    Partial drain is what we see commonly referred to as a "TFP learning experience". Just about all of us got "stuck" by the pool store, their advice, and their products which resulted in extremely high CYA and the use of wasteful products and the loss of $$$. Once you get that CYA number down and rely solely on liquid bleach, you won't have to worry about CYA getting high. Good thing you have your own test kit with refills on the way.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Stubborn Yellow Algae

    Thank you. Just so I'm understanding correctly, are you saying to hold off on the partial drain and refill until I've used the liquid chlorine? I've read all of the links posted by you and jblizzle . I'm assuming the CYA level is so high because I added Dichlor yesterday or the day before?
    Chris
    22K gal, IG Plaster w/waterfall, Pentair Intelliflo VS 3hp
    Hayward Cleaner & Filter Cartridge

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    Mod Squad jblizzle's Avatar
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    Re: Stubborn Yellow Algae

    The CYA is high because of the Dichlor and ALL the Trichlor tablets you have used in the past.

    You need to lower the CYA level ... and THEN stick with liquid chlorine in the future.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Stubborn Yellow Algae

    once you have the refills for CYA, you will need to test 50% tap water and 50% pool water and times it by 2 to see just how high your CYA is.. It is not an exact test but its close + or - 20
    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: Stubborn Yellow Algae

    Okay, I'll begin draining and replacing water today and then I'll re-run the tests again and see where I stand. Thank you!
    Chris
    22K gal, IG Plaster w/waterfall, Pentair Intelliflo VS 3hp
    Hayward Cleaner & Filter Cartridge

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    Texas Splash's Avatar
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    Re: Stubborn Yellow Algae

    You got it Chris. As you can see, lots of great advice. Post some new results after the refill of the pool (and arrival of your test kit refills) and we'll be glad to help you further. The test kit refills "should" get to you fairly quickly. While waiting on the refills (after your pool is full again) it won't hurt to add some regular liquid bleach to your water to maintain a healthy FC level and to keep things at bay to help avoid an all-out major algae bloom. You won't be able to SLAM until you read that new CYA, but the fresh liquid bleach will help you sanitize the pool somewhat while you wait. Hope that all makes sense.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Stubborn Yellow Algae

    Quote Originally Posted by Texas Splash View Post
    You got it Chris. As you can see, lots of great advice. Post some new results after the refill of the pool (and arrival of your test kit refills) and we'll be glad to help you further. The test kit refills "should" get to you fairly quickly. While waiting on the refills (after your pool is full again) it won't hurt to add some regular liquid bleach to your water to maintain a healthy FC level and to keep things at bay to help avoid an all-out major algae bloom. You won't be able to SLAM until you read that new CYA, but the fresh liquid bleach will help you sanitize the pool somewhat while you wait. Hope that all makes sense.
    Thanks for all of the great help. One more question, does it work well to place the pump in the deep end of the pool and a hose in the shallow end to get the exchange of water or is it best to just pump and then refill? I'm assuming I need to empty about half of the water? The pool is approximately 20K gallons.
    Chris
    22K gal, IG Plaster w/waterfall, Pentair Intelliflo VS 3hp
    Hayward Cleaner & Filter Cartridge

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    Mod Squad jblizzle's Avatar
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    Re: Stubborn Yellow Algae

    It is more efficient to drain and then refill, but in some cases (high ground water level, worry about heat/sun on plaster) it is safer to drain and fill at the same time.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Stubborn Yellow Algae

    Thank you. It is very hot here so I may just let it go below the light so I can remove/clean and then start the hose. Any rules of thumb on how much to drain?
    Chris
    22K gal, IG Plaster w/waterfall, Pentair Intelliflo VS 3hp
    Hayward Cleaner & Filter Cartridge

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    Mod Squad tim5055's Avatar
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    Re: Stubborn Yellow Algae

    Well, the limit of the test is 100, so,we really don't know how much above that you are. We generally suggest about 33% drain/refill with reports of 100 CYA.

    I didn't see anyone else mention this, so I'll just add - you did an acid wash which exposes "virgin" plaster. You will,have rising pH for about a year, then it,should drop to,whatever normal is for your pool. The first three months are usually the worst for pH rise.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Stubborn Yellow Algae

    Thank you. I thought I read that some where so thanks for the confirmation. The pH has been running high and I've been adding acid like crazy. It was a year in May so I'm not sure if it's gotten much better!

    Any suggestions on how much chlorine I should add until I get the results of my next CYA test after the pool is filled back up?
    Chris
    22K gal, IG Plaster w/waterfall, Pentair Intelliflo VS 3hp
    Hayward Cleaner & Filter Cartridge

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