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Is chlorinating liquid good for algae and mold removal on house siding?

Posted on 3/11/26 at 11:16 am
Posted by NatalbanyTigerFan
On the water somewhere
Member since Oct 2007
8593 posts
Posted on 3/11/26 at 11:16 am
The siding on the north end of my house has a good bit of brown algae nad mildew on it.

Would using some pool essentials chlorinating liquid in a pump sprayer followed by pressure washing it remove it?

Should it be diluted with water before applying it?
Posted by Fore III73
Member since Mar 2019
19 posts
Posted on 3/11/26 at 11:54 am to
Mold Armor, works great!

Posted by Turnblad85
Member since Sep 2022
5275 posts
Posted on 3/11/26 at 12:02 pm to
I use pool chorine in place of household bleach for washing down houses. iirc, pool chlorine is 10% sodium hypochlorite and household is 3-5%


I dilute it as much as 2 cups to gallon of water and go up to quart per gallon of water. I try to use as little as will do the job since it sucks for the wind to turn and you get a face full and its not great for the enviro in addition to being corrosive to anything it might be sensitive to.

Usually will add Jomax as it seems to help quite a bit.
Posted by ItzMe1972
Member since Dec 2013
12484 posts
Posted on 3/11/26 at 1:08 pm to
I dilute it as much as 2 cups to gallon of water and go up to quart per gallon of water.
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I've done the same. But sometimes wonder if I'm not cutting the mix to that of household bleach.
Posted by cgrand
HAMMOND
Member since Oct 2009
48227 posts
Posted on 3/11/26 at 1:22 pm to
that’s pretty much what Jomax is for…mix it with a little bleach (a little goes a very long way), spray it on and hose it off

Make sure you protect any plants that might catch overspray it will damage them. And if you have planting beds below the spray area water them well before you start
Posted by Tree_Fall
Member since Mar 2021
1210 posts
Posted on 3/11/26 at 3:14 pm to
Jomax has a number of active ingredients that bleach lacks including a fungicide/algaecide, a detergent, and an additional surfactant that makes it more effective. Use according to the label.

Discolored siding may stay wet and beginning to rot. Check for spongy soffit and siding. Replace as needed. In addition to being on the shady side of the house, you may have a roof-edge moisture problem or an overhanging tree.
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