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Question DetailsAsked on 6/22/2016

How do you get rid of mold growing on concrete over french drain in the basement?

It is only growing on a 6 foot section of the concrete over the french drain. I looked in the sump pump and the section of pipe coming from this section of french drain looked like it was partially below the water line so I lowered the float for the sump pump so it would purge with a lower water level. I also sprayed Mold Control which is supposed to remove mold and stops it from growing. The remainder of the french drain has no issue. Is there anything else I can do?

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1 Answer


Your solution sounds right and should help - as long as it does not result in too frequent a cycling of the pump, which can wear it out quicker.

If this is an unfinished concrete floor, chlorine bleach in 1:4 mix (1 part bleach) with water will do it - let stand for 15-30 minutes, or for very confined area use put down a rag (like an old towel) or synthetic sponges (natural sponges fall apart in strong bleach) along the area to be treated then saturate with the bleach solution. May degrade the concrete surface a bit but should not damage the surface much - normally not noticeable (except for white/cleaner appearance) in normal unfinished/unpainted concrete. Hydrogen peroxide will also work similarly - undiluted. Be sure to ventilate the area.

Then wash the bleach off, and scrub with a tub and toilet cleaner or Comet or such (avoid the blue or green ones - can stain concrete) or even just laundry detergent and water to remove the residual dirt and killed mold.

May take two cycles of this to get it all.

For permanent prevention you might have to paint it with a floor paint with a packet of mildewcide added in it.

Answered 4 years ago by LCD

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