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Thread: Stupid Algae!

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    Stupid Algae!

    I have been fighting algae in my pool since I bought this house two years ago. I keep my chlorine levels in check and shock the shinola out of the pool, but the algae always comes back. I suspect the culprit is the fact that my pool surface is very pourous and in need of replastering. Because of this, I'm not sure any amount of brushing will ever really get all of it.

    Considering that I just purchased the house two years ago and had a new baby last year, having the pool redone is just not on the immediate horizon financially. With that said, is there a recommended product that I can add to help control the algae...preferably something that won't throw the chemical balance too far off kilter?
    Pool Specs:
    16,000 gal. IG - Plaster - Auto Chlorinator
    FNS 48 DE Filter - 2HP Centurion Pump (A.O. Smith)
    Hayward HeatPro Heat Pump - Polaris 360

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    Richard320's Avatar
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    Re: Stupid Algae!

    Quote Originally Posted by h2o
    I have been fighting algae in my pool since I bought this house two years ago. I keep my chlorine levels in check and shock the shinola out of the pool, but the algae always comes back. I suspect the culprit is the fact that my pool surface is very pourous and in need of replastering. Because of this, I'm not sure any amount of brushing will ever really get all of it.
    When you shock the shinola out of it, is it a one-time blast or do you keep it up for several days? Do you use stabilized pucks to chlorinate? They can raise CYA so high that normal FC isn't enough.

    Think of algae as yeast. If even a tiny bit remains, it will double, then that will double, and so on until in no time you have as much as you had originally. Even if you keep the FC at maintenance level, you're not killing it as fast as it reproduces. It can hide in behind the light, in little crevasses by the skimmers, underneath pool ladder steps, in the pipe to your booster, even on the underside of your cover.

    My only advice is to carefully read How to Shock your Pool. A proper test kit will be required to fix the problem once and for all. Test strips or relying on the pool store won't cut it.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Stupid Algae!

    Just to expand on Richard's advice, the good news is that the problem is not your pool surface. As Richard pointed out, you can fix it once and for all in a matter of days but it will require a reliable test kit and a little patience.
    20K gal IG plaster pool, Manually chlorinated with 6% bleach, 1.5 HP Sta-Rite Dura-Glas II pump, Pentair FNS Plus 48 DE filter, Polaris 280

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    Re: Stupid Algae!

    When I shock, I maintain shock level for several days brushing every day until the FC level falls less tham 1ppm overnight. No matter...after a couple of weeks I will start to see a light algae bloom on the sides of the pool. I spend as much on bleach as I did on pool store chemicals bacause I am always fighting algae blooms. Another key element is that my pool will easily reach temps os 94° - 96° in the summer.

    I primarily use bleach as my source of chorine, although I use pucks from time to time as well to maintain CYA levels between 40-50ppm. I also find that I frequently need to add calcium chloride and baking soda to keep CH and TA levels up.
    Pool Specs:
    16,000 gal. IG - Plaster - Auto Chlorinator
    FNS 48 DE Filter - 2HP Centurion Pump (A.O. Smith)
    Hayward HeatPro Heat Pump - Polaris 360

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    Mod Squad Bama Rambler's Avatar
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    Re: Stupid Algae!

    Sounds to me like you're not maintaining a high enough FC for your CYA level. If you know you're prone to getting algae why wouldn't you keep your FC a little higher?

    What do you normally run your FC at?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Stupid Algae!

    Quote Originally Posted by h2o
    When I shock, I maintain shock level for several days brushing every day until the FC level falls less tham 1ppm overnight. No matter...after a couple of weeks I will start to see a light algae bloom on the sides of the pool. I spend as much on bleach as I did on pool store chemicals bacause I am always fighting algae blooms. Another key element is that my pool will easily reach temps os 94° - 96° in the summer.

    I primarily use bleach as my source of chorine, although I use pucks from time to time as well to maintain CYA levels between 40-50ppm. I also find that I frequently need to add calcium chloride and baking soda to keep CH and TA levels up.
    Sorry! I'm not sure why I thought you were a new user, but that's why I gave my advice. As for your algae problem, I can't shed any further insight because the FC/CYA chart has kept my pool algae free since beginning BBB. I'm also in Texas so I have a smokin hot pool as well, and furthermore at around 30 years old, my plaster is also rough/porous. Your filter/circulation is working properly?
    20K gal IG plaster pool, Manually chlorinated with 6% bleach, 1.5 HP Sta-Rite Dura-Glas II pump, Pentair FNS Plus 48 DE filter, Polaris 280

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    Re: Stupid Algae!

    Quote Originally Posted by Bama Rambler
    Sounds to me like you're not maintaining a high enough FC for your CYA level. If you know you're prone to getting algae why wouldn't you keep your FC a little higher?

    What do you normally run your FC at?
    At the target CYA level of 40, i try to keep FC between 4 and 5...pretty much dead in the middle of the target range. Obviously, if CYA levels increase, so does my target FC level.

    My filter went down over the weekend due to holes in a couple of grids and I was blwing DE all over the pool. I replaced the grids and cleaned everything out real well so I figure now is a good time to figure this algae issue out. Once I got the filter back up and running, I tested the water and my TA and CH levels were low. I added 10 lbs of baking soda and 10 lbs of calcium chloride.

    Here are my test numbers from yesterday.

    FC - 15
    CC - 0
    TC - 15
    pH - 7.7
    TA - 110
    CH - 250
    CYA - 50
    Pool Specs:
    16,000 gal. IG - Plaster - Auto Chlorinator
    FNS 48 DE Filter - 2HP Centurion Pump (A.O. Smith)
    Hayward HeatPro Heat Pump - Polaris 360

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    frustratedpoolmom's Avatar
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    Re: Stupid Algae!

    I'd suggest running with higher FC min - shocking the pool like you have been doing then - a 24 hour Mustard Algae shock, treating all toys, floats etc. scrubbing by ladders, steps etc., and then running with the MA min for a few weeks - see if that does the trick.

    Refer to this chart for the yellow/mustard levels I'm talking about.
    http://www.troublefreepool.com/chlor...art-t2346.html Not saying you have mustard algae but perhaps something is going on and a higher level would take care of the issue?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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