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Thread: removed liner black and green everywhere on sand

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    removed liner black and green everywhere on sand

    We just bought the house in September. The main drain had a horrible leak. So we replaced that and the skimmer but when we had the liner removed the sand was covered in black and green mold and even some moss. What is the best course of action to fix this? I hope to not have to shell an additional 2 grand for new sand and bottoming.

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    Smykowski's Avatar
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    Re: removed liner black and green everywhere on sand

    Welcome to the forum!

    Are you saying that the sand inside the filter was gross and green? How does the bulk water in the pool look?
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Re: removed liner black and green everywhere on sand

    I think they are saying the sand under the liner was green and black.

    I am not sure what you should do about it. I would say nothing as long as the sand is compacted. IF you take any sand out and try to fill in the hole it may cause more problems once you put the liner back in.

    With above ground pools it is taught to take dirt OUT instead of adding dirt to make it level. I would think it would be the same idea.

    Hopefully someone else will come along and know the best way to deal with it.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    pwrstrk's Avatar
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    Re: removed liner black and green everywhere on sand

    Welcome to TFP !
    Just thinking maybe you could use a pump sprayer with a water bleach solution and spray the areas to kill it off.
    Could you post a picture if it ?
    Also if you could add all your pool and equipment info to your sig that will help us better help you. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: removed liner black and green everywhere on sand

    Thanks for all the quick reply I used a pump sprayer and some concrobium but that's for indoor use I don't want it to be for nothing

    It is the top layer of sand. When the pool liner was removed you can see the clean layer in some locatuons. Also it looks like where they patched it previously is clean.

    Here is a photo


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    Re: removed liner black and green everywhere on sand

    Oh my! Looks like bleach, bleach, bleach to kill that algae.You also have some leak repairs to fix. What does your PB say?

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    Re: removed liner black and green everywhere on sand

    I don't know what a pb is. Yea we have replaced the main drain and the skimmer and both lines. The big issue is we need to build a retaining wall. We have a sloped lot on a down grade towards house.

    - - - Updated - - -

    Only thing with bleach is I heard it only fixes for a week and it comes back I'm looking for something permanent

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    Re: removed liner black and green everywhere on sand

    Pb I believe is pool builder...
    13,000 Gal Pool & Spa
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    pwrstrk's Avatar
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    Re: removed liner black and green everywhere on sand

    Wow I wasn't expecting that. I would think something can be done about it. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: removed liner black and green everywhere on sand

    Yea, wow..... and yes, I meant pool builder. Just assuming you are getting outside help.

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    Re: removed liner black and green everywhere on sand

    Pool builder wants me to try the mold control stuff he said removing and refilling would be 2k we are tapped out now as we've just bought the house in September and we just dropped 4k on the new liner maindrain and skimmer+ line
    I was hoping someone might have experienced this before and knew a way to kill it all in a week so we can install new liner before the highs dip below 50 in north georgia

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    Re: removed liner black and green everywhere on sand

    Unfortunately, I can think of no quick, easy fix for a condition that badly neglected (years!).

    If you want it done in a week, I think you will have to pay someone.

    If you want to clean it up yourselves, it will take much longer to scrape away all the solid debris and THEN use chlorine on it.
    Only thing with bleach is I heard it only fixes for a week and it comes back I'm looking for something permanent
    I am not sure why someone would say that. Bleach is the BEST way to keep organics out of your pool......on either side of your liner. Did someone propose an alternative?
    Dave S.
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    Mod Squad zea3's Avatar
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    Re: removed liner black and green everywhere on sand

    Once you kill the mold and mildew it will stay away if you keep the ground dry, regardless of how you kill it. I think your bigger issue is going to be controlling the ground water or surface water run off to prevent that from happening again. How do you plan on addressing the rust on the pool walls?
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    Re: removed liner black and green everywhere on sand

    I would second the bleach comment, spray,spray and spray some more. I do not know of anything that will kill mold like bleach will. Go 100% bleach if need be. Just wear a respirator.

    And for the rust on the walls I would recommend some type of product that stops the growth of rust. There used to be a spray on or brush on type of "jelly" that we used to use in the auto body industry to neutralize the rust and prevent spreading. Then spray with silver rustoleum paint.


    30x20 vinyl IG, Hayward SD60 with Pentair Dynamo 340219 2HP pump, Compupool CPSC24 SWG, Hayward H200FDN heater. APC automatic pool cover.
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    Re: removed liner black and green everywhere on sand

    Well, I am curious about your plans.

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    Re: removed liner black and green everywhere on sand

    Bleach will be cheapest, but does not last against black mold. But there is a product used on molded wood/water damaged areas called boracare that has boric acid, which penetrates wood and deeply prevents the return of mold. I have no idea if it would work on sand or not (its very thick/viscous) and sinks in to prevent a return...you have to use a paint mixer to stir it. But it might we worth experimenting.

    I've used it on a 2,000 ft crawlspace with great outcome but its pricy for that kind of coverage ($100 a jug). If you want to read up on it, check it out here: http://store.doyourownpestcontrol.co...with-mold-care

    If it sunk into the sand far enough, I might at least hold til you got the liner in.
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    Re: removed liner black and green everywhere on sand

    This is a question coming out of ignorance... but, what danger does all this organic material pose under a liner? Would its continued growth/existence harm the new liner in some way? I agree it's ugly; just wondering what the practical hazard is.

    How bad is the rust on the metal panels -- i.e. how deep does the rust damage go in the worst areas?
    18' x 48" ring top pool (Summer Escapes); 5500 gallons; set up June - October, stored during winter; Intex 2500 gph pump (B size cartridge filter) Hayward 21" sand filter + 1.5 hp single speed Powerflo Matrix pump (upgrade October 2016) *** K-2006 test kit, refills from tftestkits

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    Re: removed liner black and green everywhere on sand

    Sorry my email stopped updating me on responses some reason. The pool builder was nice enough to let us make monthly payments. The pool has been scraped free of mold I'm unsure if they added a treatment of anything on the ground. About the rust. He sanded it then applied rustoleum paint I think. All in all looks like 2800. For the bottom. They will be applying foam to the wall which is something else the previous owner neglected. The main drain was a single drain and was connected with threaded ends and Teflon tape. The guy could wiggle up and down large amounts on the maindrain plumbing so I figure that's how the ground was kept saturated for that mold

    Anyways this is what it looks like now


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    pwrstrk's Avatar
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    Re: removed liner black and green everywhere on sand

    That looks a lot better ! 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: removed liner black and green everywhere on sand

    Wow! Night and day!!!
    14K Freeform Gunite w/60% Blue Quartz plaster, Quad DE filter, Intelliflo VS Pump + Booster for Cleaner, Aquacal Heat Pump

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