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Thread: Black Algae in my pool (one month after SLAM and following TFP)?

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    Black Algae in my pool (one month after SLAM and following TFP)?

    I finished my SLAM (in another thread) just over a month ago. Since then I have been carefully maintaining proper levels of FC based on my CYA.

    I noticed a week ago what looked like a "clump" of algae on the threads of one of the returns. Thought maybe I had missed brushing it from before (although I didn't think so). I brushed it off and went on my merry way.

    I was just commenting to a friend this past week (jinx!!) that for several years I saw algae on the grout of my tiles all the time and didn't see that anymore. Well, today, I noticed it was starting again. It doesn't form on the fiberglass, just on the tile grout (or areas where the grout has broken off). When I scratched at the little black mound with my fingernail, it was obviously green underneath and I know that it wasn't there earlier this week.

    I have been testing chlorine daily. PH every two or 3 days and everything else other than CYA and CH once a week. CH and CYI I only test when something happened that could change them.

    Test results just now :

    FC 7.5 (I usually test in the evening and add what is needed to bring it back up to 9)
    CC 0
    PH 7.5
    TA 110
    CH 400
    CYA 55

    So, everything still seems correct. Assuming it's black algae, I found the pool school article and I will bump my FC up to between high normal and SLAM level. And, brush daily.

    Before I found TFP, I had purchased "PhosFree" from Leslie's. But, I haven't used it... it's just sitting in the garage. Is it worth adding?

    I'm surprised that this has occurred after several weeks of faithfully following the protocol so, I'm looking to figure out what else I need to be doing to prevent it from occurring again. Or, is black algae just that much of a pain that I will just have to always watch for it?

    Thanks!

    Toni
    25K gal, fiberglass, Hayward 1hp pump, Sta-rite 30" sand filter, Hayward Pool Vac

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    I don`t think the Phosfree is necessary but I`m sure someone with more knowledge will chime in soon.
    35900 inground, 1 1/2 hp superpump, Jacuzzi sand filter, barracuda 3 cleaner

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    northrn's Avatar
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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    You should follow the SLAM for black algae. This tells you more about the process. Black Algae
    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    Black algae is normally found in pools that have been badly beglected for a lon period of time......You don't really fit that.

    I suggest you SLAM the pool correctly and observe what happens to the "black algae"
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    I brushed all the tile, around the returns and the light with a stainless brush - everyplace it could be hiding. I was SHOCKED at the amount of algae that was on/around the light. Wasn't visible to me but there was a lot! I must not have brushed the light well enough during my SLAM in May.

    I added extra liquid chlorine and will keep the level up until this is resolved.
    25K gal, fiberglass, Hayward 1hp pump, Sta-rite 30" sand filter, Hayward Pool Vac

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    Did you remove your light during your SLAM in May? With your current description I'd advise removing the light and brushing behind it if you haven't already done so.

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    OK. I admit it... I did not remove the light.

    Water and electricity don't mix and it makes me nervouse Also, the previous homeowners did some weird things when they installed things. The light isn't on the same a breaker as the pool -- there's a gfci that we had installed when we had the fiberglass put in (over plaster) 20 years ago or so.

    I just don't feel comfortable doing that myself (without cutting power to the house which isn't fun in an AZ summer), so I'd need to hire someone to get it done. Not even sure who I'd call for that one. I guess if this becomes a recurring issue, I'll have to do it... maybe in the fall when it's cooler.
    25K gal, fiberglass, Hayward 1hp pump, Sta-rite 30" sand filter, Hayward Pool Vac

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    I use the regular pool perfect (not pool perfect + phos free) because sometimes we have a lot of sun tan lotion on the kids. I don't get the black stuff on the grout anymore.
    Inground 22k gallon gunite 15x31 main pool, 15x7 wading pool/sunning deck, hot tub/with overflow (9' octagon with limestone top) & slide NSWG, Aqua Blue Pebble Sheen
    Filter dual cartridge Sta-rite 450sq/ft, TF-100 Test Kit
    Heater Raypak 2100 400k btu cupro-nickel exchanger
    Auto pool cover, Polaris 280 auto pool cleaner, Jandy AqualinkRS8 Remote Control System

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    I decided to stop being a chicken about the light. Realized that with the switch off it should be fine.... so, the light is now out. There was a bunch of **** that fell into the pool. Light is now floating on the surface so back to SLAMing.

    I found another source of algae that I didn't brush during my earlier SLAM. The hose sections from my pool vac. They were in the pool the whole time so I never looked closely. Around the threads there was some and the new stuff was forming on the outside of the hoses.

    Thanks again for the help!
    25K gal, fiberglass, Hayward 1hp pump, Sta-rite 30" sand filter, Hayward Pool Vac

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    Any pool toys which have been used between then and now should be scrubbed down with a solution of 50% household bleach and 50% water.
    Bathing suits should be run through the laundry.

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    No toys. Just me, my pups and an occasional tennis ball (ok, I know that's a toy but not your typical pool toy ).

    I have been wearing one bathing suit in the pool with elevated chlorine (below SHOCK when I go in) to do the brushing. I am assuming that is just as good as the washing machine since it's getting exposed to the chlorine. True?

    The pool looks awesome today.

    Another area that seems to have some algae hiding is where the gel coat is separating. We installed the fiberglass with a lifetime warrantee and they're coming to look at it tomorrow. Once we figure out a plan, I'll probably brush away the loose gel coat to eliminate that hiding place for Al G.
    25K gal, fiberglass, Hayward 1hp pump, Sta-rite 30" sand filter, Hayward Pool Vac

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    If you have dogs swimming in the pool try the pool perfect I mentioned above. There is a youtube video where the pool maintence company used this to fix the problem and showed the weekly progress with a client with two dogs. This is one of the cases it may help you with a magic potion : )..I know they hate the stuff around here.
    Inground 22k gallon gunite 15x31 main pool, 15x7 wading pool/sunning deck, hot tub/with overflow (9' octagon with limestone top) & slide NSWG, Aqua Blue Pebble Sheen
    Filter dual cartridge Sta-rite 450sq/ft, TF-100 Test Kit
    Heater Raypak 2100 400k btu cupro-nickel exchanger
    Auto pool cover, Polaris 280 auto pool cleaner, Jandy AqualinkRS8 Remote Control System

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    wrj75,

    I doubt you will find many on the forum who "hate" pool perfect

    What this forum is all about is teaching you to understand what is in the chemistry you use and the affect it will have on your pool.

    Whether you decide to hate it or not is a choice that should be an informed decision but based at least partly on what you can learn from this forum.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    Quote Originally Posted by tibunekubda View Post
    No toys. Just me, my pups and an occasional tennis ball (ok, I know that's a toy but not your typical pool toy ).

    I have been wearing one bathing suit in the pool with elevated chlorine (below SHOCK when I go in) to do the brushing. I am assuming that is just as good as the washing machine since it's getting exposed to the chlorine. True?

    The pool looks awesome today.

    Another area that seems to have some algae hiding is where the gel coat is separating. We installed the fiberglass with a lifetime warrantee and they're coming to look at it tomorrow. Once we figure out a plan, I'll probably brush away the loose gel coat to eliminate that hiding place for Al G.
    You are finding all the algae hiding places

    Please post pics and update us on the FG repairs.
    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.

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    Re: Black Algae in my pool (one month after SLAM and following TFP)?

    Don't forget stairs/ladders. I found a bunch inside my ladders. We left them on the floor of the pool opened up, completely taken apart with all the stairs, etc taken off during the slam. I did a super slam first by using a bleach rinse and we threw them in. It helped get me over the hump.
    22,000 gallons, IG ,vinyl, AstralCantabric sand filter, magnatech century corp. pump- 2.0 HP, Just took over home with an August 4, 1975 pool and system, though pump, filter and lining have been replaced at one point. Have been to swamp and back....

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