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Old 04-14-2019, 02:59 PM   #41
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Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
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Originally Posted by Raven8109 View Post
I would use a solution of white vinegar and water. I would start at 50%, let it sit 24 hours, and flush.
Acetic acid will certainly help dissolve calcium carbonate based deposits and make slime much harder to remove, acid doesn't phase slime much at all

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Old 04-14-2019, 04:17 PM   #42
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Brand: Thor Motor Coach
Model: Tuscany 40ex
State: Ohio
Posts: 443
THOR #12726
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Originally Posted by BrentB View Post
I know there are many threads about how to sanitize tanks, and I have done that, but I still have a problem. While using my water pump, water would flow ok for a while, then slow to a trickle and stay there. I finally discovered that the pump filter was clogged with algae. I cleaned the filter, but the same thing happened again, so I decided to take a look in the tank and the result is what you see in the photo.

This gunk is not fazed by bleach, even at 200 ppm, and is too big to drain through the tiny 3/8 inch drain hole. I would love to scrape and scrub the inside of the tank to get rid of it, but of course the problem is gaining access. My first thought was some kind of access port, but I am having difficulty finding something that I think would work.
I found this, but it seems too small: https://www.marinesan.com/Holding-Ta.../307238685.htm

I found this, but it seems too large: Access Panels|tank|hatch|boat|water|TCL4

And I’m not sure if either will withstand the pressure of being submerged. (There is no access to the tank from above.)

I also thought of installing a larger drain fitting, hoping that the gunk will drain out, but I see that the spin weld fittings require a router, not a drill, and I don’t want to buy one of those. The only access to the tank is from the bottom or one end and the tank is about 4-5 feet long.

I just ran across this, not sure if it would work to build a larger drain: https://www.usplastic.com/catalog/it...x?itemid=89951

I really want to clean the gunk out without removing the tank as that is not easy to do.

Does anyone have any other solutions that I haven’t thought of?
If nothing else works I would try a liquid algaecide and shock for pools but I would not run it through any faucets or water heater just the tank and let it sit for a few days to kill of the algae and then drain and flush several times, pool chemicals are much stronger concentration of bleach then household and with the algaecide mixed with it should do the trick, but read the directions as you would add algaecide first and ideally find a way to keep the tank water moving by recirculating it like maybe from the pump with a hose back into the tank, and next day shock it and let the mixture run through for 24hrs and flush it all out and rinse and it should be clean
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