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 Algae growth in cold water line
Author: oriole1 (MT)

We have an unfinished basement so the cold and hot water lines inside the house are exposed to sunlight. We have just noticed a green algae growing in the cold water line.(only on the side of the basement that gets the sunlight). Any suggestions to 1. get rid of the algae and 2. prevent from recurring. We do not plan to finish the basement quite yet.

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 Re: Algae growth in cold water line
Author: mjb1962853 (NY)

Cold water line in moist basement air will develop condensation. This will lead to green oxidation and/or possibly mold/mildew/algae? growth.

I'd bet it is just oxidation. Regardless, clean with scotchbrite dish scrubbie and mild soap/water solution, rinse & dry thoroughly, cover BOTH hot and cold lines with insulation. Suggest you get a good dehumidifier also.

Before you finish basement have a pro come in to check if you have proper EXTERIOR waterproofing. I would NOT finish the space until you are 100% certain about how the basement is waterproofed.

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 Re: Algae growth in cold water line
Author: oriole1 (MT)

Thanks for the suggestions, however, the algae is on the INSIDE of the cold water piping (it is clear tubing). We thought perhaps adding a little chlorine in the line would help. (We are on well water).

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 Re: Algae growth in cold water line
Author: LemonPlumber (FL)

First water incoming would be the consideration.Algae you are sure??? Copper break down from high ph acidity also delivers this coloration.Is this cold line unused???Is it tied directly in on the feed to the water heater and does the heater have a heat loop/trap??Flow of a chlorinated water source through the tubing would normally prevent any thing from growing in copper ,which in it;s own composition would tend to stop this type growth.I would look toward high ph as eating your tubing.and less at uv contamination if water runs through this line daily.Will be waiting for more info.

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 Re: Algae growth in cold water line
Author: mjb1962853 (NY)

Sorry, mostly copper supply lines in this area.

I've heard this can happen with PEX, but have never seen it first hand. Assuming that is what you have, PEX does not like sunlight. Part of future prevention will be to shield it somehow.

Suggest you contact a certified water treatment specialist regarding how to "safely" treat your well water and clear the algae in the lines.

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 Re: Algae growth in cold water line
Author: jimmy-o (CA)

Do you have a whole house filter which is removing the chlorine from the water? That will cause it. Any clear tubing, like PEX, should not be exposed to sunlight at all.

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 Re: Algae growth in cold water line
Author: GSchreiber, CWSVI (MN)

Chlorinate, have done by a Plumber or Water Treatment Specialist, and then wrap the clear tubing that is exposed to sunlight with material that will prevent exposure of the water to sunlight.

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 Re: Algae growth in cold water line
Author: oriole1 (MT)

Thanks to everyone for their suggestions! Our tubing is not copper but clear. We have contacted a local water specialist and they suggested buying a chlorine kit to put into the well. Our only concern with this is that we have underground sprinklers so we will shut off water supply to the sprinklers and flush the system before using sprinklers. Then we will take measures to ensure the tubing is not exposed to sunlight. Thanks again to everyone for their suggestions!

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 Re: Algae growth in cold water line
Author: PBwrencher (WI)

Replace with copper piping.:)

Copper is will noted for killing the growth of algae and is used in all hospitals for there domastic water piping that I have worked in.:think:

91509,15+12

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 Re: Algae growth in cold water line
Author: dlh (TX)

it is also used for medical gas

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PLUMBERS "Protecting The Health Of The Nation"

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 Re: Algae growth in cold water line
Author: PBwrencher (WI)

Medical gas and water are some what differn't elements, don't you think:?::think2:

92609,8+29

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 Re: Algae growth in cold water line
Author: dlh (TX)

and?

it refers to how copper piping is good for your health

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PLUMBERS "Protecting The Health Of The Nation"



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