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Thread: I'm trying to make a chamber type of filter system. Help please~

  1. #11
    Nisai
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    Is there a need for sealing the concrete with some sort of epoxy to make it waterproof? Or would it be fine with just regular concrete? I'm thinking of just pouring concrete to a boxed frame and knock it off once it hardens...

    Also, how long does it take to cure concrete? dimensions are 3'x6'x3'

    Thanks

  2. #12
    Tategoi mtsklar's Avatar
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    When you pour the walls for a bay type filter you should build your forms on top of the concrete that forms the bottom of the bay or pour the walls and then once cured pour the floor inside. Either way you have 2 parts with a seam at the base of the wall. Sealing the bay with epoxy, liquid epdm, CIM, or polyurea is a good idea. Each product applies and performs differently.

    Eventually concrete will crack. Choosing a water containment product that will not fail when the concrete cracks is important.

    One option would be to bury a poly tank of some type and avoid the whole issue of waterproofing concrete.
    Matt Sklar

  3. #13
    Honmei ricshaw's Avatar
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    Quote Originally Posted by poisonXvenom View Post
    Is there a need for sealing the concrete with some sort of epoxy to make it waterproof? Or would it be fine with just regular concrete? I'm thinking of just pouring concrete to a boxed frame and knock it off once it hardens...

    Also, how long does it take to cure concrete? dimensions are 3'x6'x3'

    Thanks
    Old school California Japanese style was to use 50/50 (cement/silica sand) "plaster" coat to water proof concrete.

  4. #14
    Honmei ricshaw's Avatar
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    Quote Originally Posted by Meg View Post
    Ric is that the same as when a swimming pool is plastered? and do you need to then paint or seal it with something?
    I do not know what exactly is used to plaster a swimming pool, but yes, the same idea as plastering a swimming pool.

    No paint or epoxy seal coat needed after two coats of cement/silica sand 50/50 plaster mixture.

    It worked for me.

  5. #15
    Nisai
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    Quote Originally Posted by ricshaw View Post
    I do not know what exactly is used to plaster a swimming pool, but yes, the same idea as plastering a swimming pool.

    No paint or epoxy seal coat needed after two coats of cement/silica sand 50/50 plaster mixture.

    It worked for me.
    Does home-depot carry silica sand? Is it just play-sand? Also, how much water do you add for concrete? Is it better to have it thick?

  6. #16
    Honmei ricshaw's Avatar
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    Quote Originally Posted by poisonXvenom View Post
    Does home-depot carry silica sand?
    Maybe. Just ask. It usually comes in bags in more than one mesh size.
    30 mesh is good for what you want.

    Is it just play-sand?
    No. Play sand is courser and the mesh size is not as consistent.

    Also, how much water do you add for concrete? Is it better to have it thick?
    I can't explain that.

    Too much water and it will not stick to the concrete.
    Too thick and it will not trowel on smooth.

    The finish should be as smooth (or almost as smooth) as a swimming pool.

    Once you get the consistency right... it goes on like butter.

  7. #17
    Jumbo bighatbulls's Avatar
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    Quote Originally Posted by poisonXvenom View Post
    Does home-depot carry silica sand? Is it just play-sand? Also, how much water do you add for concrete? Is it better to have it thick?
    YES home Depot does carry silica sand. its was about $3.50 at our store.

  8. #18
    Nisai
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    Thank You all. I just finished the filter pit. I found this cement- I think it was called topping cement- its a mixture of cement and sand. This held water fine with one coat. I had already ordered epoxy beforehand, so I will be putting that on after a couple water changes to get the toxins out of the cement just to be sure.

  9. #19
    Tategoi mtsklar's Avatar
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    Quote Originally Posted by poisonXvenom View Post
    Thank You all. I just finished the filter pit. I found this cement- I think it was called topping cement- its a mixture of cement and sand. This held water fine with one coat. I had already ordered epoxy beforehand, so I will be putting that on after a couple water changes to get the toxins out of the cement just to be sure.
    Can you share any photos of your project?

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