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Thread: Algae on liner.

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    daytoman's Avatar
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    Algae on liner.

    I'm having a terrible problem getting rid of the algae on the liner. My water is crystal clear, chemicals are balanced....but there is a green "film" on the floor and wall of the liner.
    Ive tried brushing several times to filter it out. Ive added pods and cellulose to help my sand filter. I'll back wash and green will wash out of filter. But the green always either settles or grows back to the floors/walls of the liner.
    Ive brushed and super shocked, which seems to help for a day or two, then it returns. Ive tried running some extra 3" pucks to the skimmer as well to up the chlorine.

    Last night I vacced to waste then brushed, added cellulose and let it filter. Still a little bit cloudy this morning but I'm waiting to see if the green film returns.

    Any ideas?
    We've had a pretty good amount of rain over the last few weeks. No gully washers, rather a steady normal rain. Ive always made sure to shock after a rain. Its been pretty windy and of course Pollen is high.

    Is it time for an algaecide?

    Thank you!

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    Re: Algae on liner.

    You need to SLAM the pool: http://www.troublefreepool.com/conte...tain-shockingl

    Post back with any questions and someone will be around to help.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    Re: Algae on liner.

    You need chlorine in your pool....not filtration. You can never filter green algae from your pool....you must kill it with chlorine.

    read "The ABC's of Pool Water Chemistry" up in Pool School. That'll give you a good start and then we'll need some current test results to help you get into the SLAM process above.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Algae on liner.

    Thanks. I'll go get it tested today and report back.

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    Re: Algae on liner.

    Water test results:

    Free Avail Chlorine= 5+
    Total Avail Chlorine= 5+
    PH= 7.4
    Total Alk= 90
    Cyanuric Acid= 90
    Total dissolved solids= 1000
    Phos= <100


    As I stated, I vacuumed 98% of the green film to waste and brushed last night. Its mostly clear today, just a tiny bit cloudy.
    I'm thinking that the rain is feeding the algae growth. Maybe if I continue to shock it immediately after a rain I can keep the green out. At this point I'm not so sure I need to SLAM the pool.

    What do you guys think?

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    Re: Algae on liner.

    1. You need to get a proper test kit. We don't usually trust pool store results. Especially on the CYA.
    2. Sounds like you need to SLAM your pool. That is a process not a product. It will be very difficult with CYA is truly 90.

    Have you read ABC's of Pool Water Chemistry in pool school yet? It may take a few reads and it will begin to sink in.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Algae on liner.

    I'm not sure why its that high either. I replaced at least a 1/4 of my water this year in a 25k gl pool. This was tested at the pool store and my test strip read very high for CYA as well but from what I can tell from test strips, I was thinking more around the 40-50 range.

    They tested it for me about a month and a half ago, when I opened it, in which I replaced the water at that time, and CYA tested out at 100.

    - - - Updated - - -

    The last time I put any stabilizer in the pool was this time last year.

    I guess I'll need to get my own test kit. lol

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    Re: Algae on liner.

    I'm reading pool school and I think Im starting to get an idea.

    CYA is too high, so chlorine is becoming ineffective. Even though I haven't added any stabilizer, my over use of pucks are adding it and its not dissipating.I wonder if all the Power Powder Plus Ive been adding is contributing to the problem? I'm not even sure what type of chlorinator is in that stuff. I just use it cause they recommend it.

    Should I not be using 3" pucks any longer?

    Also what should I be shocking with? Just liquid bleach?

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    Re: Algae on liner.

    Yes you need a test kit.

    Sounds like a lot of reading in pool school may be needed. You haven't said how you are chlorinating. You mention "shock" is this a product you are using?
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Algae on liner.

    OK, 12 years with a fraking pool and now my mind may be blown.

    Do I have this right? After a SLAM, does TFPC recommend that you only use liquid bleach to keep your pool chlorinated? Does this mean, no more pucks? no more shock powder?

    Weird thing is, this is what Ive always used and Ive not had this problem. Ive never had a single year where CYA has been high. Ive added it and by the end of the year its about time for more. What the heck is going on I wonder?

    - - - Updated - - -

    Quote Originally Posted by AimeeH View Post
    Yes you need a test kit.

    Sounds like a lot of reading in pool school may be needed. You haven't said how you are chlorinating. You mention "shock" is this a product you are using?

    Ive been using Leslie's 3" jumbo tabs as my normal, daily chlorinator, due to the algae, Ive been putting 4 in the floater and 1 or 2 in the skimmer to try and raise my chlorine, to keep algae down. Ive been using Leslie's Power Powder Plus as my "shock" after a rain or after brushing to try to help kill the algae.


    From what Ive read so far, it all seems counter productive.

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    Re: Algae on liner.



    Welcome to the dark side. Pucks and dry chlorine are evil. Liquid chlorination (ie bleach) is the name of the game.


    You are getting the hang of it!
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
    Pool School -- Pool Math -- TF-Test Kit

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    Re: Algae on liner.

    Quote Originally Posted by daytoman View Post
    OK, 12 years with a fraking pool and now my mind may be blown.

    Do I have this right? After a SLAM, does TFPC recommend that you only use liquid bleach to keep your pool chlorinated? Does this mean, no more pucks? no more shock powder?
    Well, yes -mostly. You can use other forms of chlorine sometimes, as long as you understand the effect they have on your water.

    Solid/granular forms of chlorine contain things other than chlorine and can have side effects, like having too high CYA or CH and needing to drain to fix the problem.

    Most of us use bleach/liquid chorine or an SWG. Lots of folks use an automated pump for the bleach/liquid chlorine. Lots of us just add the necessary amount of bleach/liquid chlorine daily by pouring from a jug.

    And most of us are pool snobs and have very, very sparkly pools
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Algae on liner.

    Quote Originally Posted by Butterfly View Post

    And most of us are pool snobs and have very, very sparkly pools
    Yep.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Algae on liner.

    The weird thing is that all the years, with only a few exceptions, the pool has been very sparkly. LOL!

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    Re: Algae on liner.

    Keep reading. You may decide to head back to the Pool Store or you may decide to learn how to manage your own pool with confidence and common sense. The more you read, the more likely common sense will take over.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  16. Back To Top    #16
    daytoman's Avatar
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    Re: Algae on liner.

    Yes, this makes sense and I think I like it!

    But it sounds like a lot of trouble to change over right now. According to the PoolMath calculator, I'd have to replace 56% of my water just to get the CYA to 40....I still don't think thats even low enough. Thats over 13,000 gallons. I just had the CYA double checked at another location and I'm sure this high CYA is sue to the overuse of tabs and shock. I think I may start this system next year.

    For now, I think I'll be backing off of my tabs, replace a little water and go get some algaecide. I'll just try to get by for the rest of the year.

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    Re: Algae on liner.

    Quote Originally Posted by Butterfly View Post
    Well, yes -mostly. You can use other forms of chlorine sometimes, as long as you understand the effect they have on your water.

    Solid/granular forms of chlorine contain things other than chlorine and can have side effects, like having too high CYA or CH and needing to drain to fix the problem.

    Most of us use bleach/liquid chorine or an SWG. Lots of folks use an automated pump for the bleach/liquid chlorine. Lots of us just add the necessary amount of bleach/liquid chlorine daily by pouring from a jug.

    And most of us are pool snobs and have very, very sparkly pools


    How much liquid chlorine does the average pool go through a month?

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    Re: Algae on liner.

    My 30K pool is now at about 3 gallons of 12.5% per week with my CYA bumped to 40. So 12ish per month. I've been getting them for $2.50 a gallon. $30 a month plus cost of daily self testing which is maybe $5-10 a month.

    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
    Isolated Spa - 345 Gallons

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    daytoman's Avatar
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    Re: Algae on liner.

    Quote Originally Posted by JVTrain View Post
    My 30K pool is now at about 3 gallons of 12.5% per week with my CYA bumped to 40. So 12ish per month. I've been getting them for $2.50 a gallon. $30 a month plus cost of daily self testing which is maybe $5-10 a month.

    Sent from my SCH-I545 using Tapatalk
    Thanks for chiming in. Well, that sound great! How often do you add chlorine?

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    Mod Squad JVTrain's Avatar
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    Re: Algae on liner.

    I'm pretty fussy about it, so every day after sundown. Some go every other. If I'm gone, my wife adds daily what pool should be using and tests when she can.

    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
    Isolated Spa - 345 Gallons

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