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Old 11-18-2020, 02:22 PM   #1
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TSP to clean black water tank?

What are your thoughts?
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Old 11-18-2020, 02:50 PM   #2
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Why?
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Old 11-18-2020, 03:01 PM   #3
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it's a really good cleaner and has no smell
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Old 11-18-2020, 03:06 PM   #4
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Finding TSP these days is nearly impossible, most things that appear to be TSP sold today are "TSP substitutes" if you read the fine print.
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Old 11-18-2020, 03:35 PM   #5
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Iím with solo rv guy, why?

A squeaky clean black tank isnít gonna stay that way long! Better to simply practice good tank hygiene. Use plenty of water with each flush, do not have the fan on and toilet valve open, let it fill far enough to get up a good head of steam when dumping, and use your tank flush every dump, if possible. If you donít have a tank flush, install one.

I donít find that the tank chemicals do much besides being a convenient way to literally throw money down the toilet. Others swear by them though so who knows.

I will toss the occasional Cascade dishwasher pod down the commode if weíre traveling with non-empty tanks to help things break down, but I suspect thatís a waste of money too.

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Randy
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Old 11-18-2020, 03:50 PM   #6
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I would like my liquid lever sensors to be more accurate, I keep thinking muck is on the sides at the sensor, just looking for something to do a better job of cleaning. Showing a full tank on the first day of travels causes concern. I found a older bag of TSP at a garage sale. I have a build in flush for the black tank and it shows empty for a day after cleaning. Just trying different things. I'm not looking to sanitize it, just remove any mold, algae, mildew, or what ever.
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Old 11-18-2020, 04:47 PM   #7
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The solution is to install a non-contact type tank level sensor such as the SeeLevel 709 system, I installed one on my coach a few years ago, and don't know how I ever lived without it. Total cost DIY was around $250 to put new sensors on the black, gray and fresh water tanks, I reused the old wiring and replaced the factory 1/3, 2/3, full LED panel with a section of prefab countertop end splash and the SeeLevel display. Having about 3-4% level resolution certainly beats the is it 66% or 99% full question. Now I can see that my fresh water is down to 18% and know if I need to break camp and fill or give it another day, and not have to guess.
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Old 11-18-2020, 07:41 PM   #8
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4 lbs Borax and 7 gallons of water. Go for a 20 mile round town drive.
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Old 11-18-2020, 09:55 PM   #9
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Use something else then TSP
Keep it out of septic/sewer system

Borax, Unique RV Tank Cleaner, GEO Method (Calgon, Dish Soap, Household Bleach) ETC

Lots of options vs TSP


**Hope you have been handling that old bag of TSP with gloves
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Old 11-18-2020, 10:35 PM   #10
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Quote:
Originally Posted by Isaac-1 View Post
Finding TSP these days is nearly impossible, most things that appear to be TSP sold today are "TSP substitutes" if you read the fine print.
Yep, all Phosphate has been removed by EPA rules. I bought a box about 10 years ago, still 1/2 full, doesn't work nearly as well as original formula.
I found a different product works well, liquid automatic dishwasher soap. I premix a cup into a 5G bucket of water and pour it into the black tank just before beginning a days drive homeward bound, I do that at least once a year.
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Old 11-18-2020, 11:42 PM   #11
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mixed messages on tsp safety

Quote:
Originally Posted by Old-Biscuit View Post
Use something else then TSP
Keep it out of septic/sewer system

**Hope you have been handling that old bag of TSP with gloves
One site says, " According to the Food and Drug Administration, a person can safely consume up to 70 grams of the additive every day without risking health issues". another says it kills you. No, I didn't use gloves.
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Old 11-19-2020, 04:28 AM   #12
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TSP is an excellent cleaning agent. However, it is hard to find, but many hardware stores do stock it in 1 lb tubs. It will definitely clean your tanks. Partially fill the tanks, put in some TSP, drive around for a couple of hours, and then drain and rinse the tanks. May take a couple of sessions to fully clean the tank.
Good luck.
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Old 11-19-2020, 05:25 AM   #13
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I buy the actual TSP at paint stores like Sherwin Williams. Home retailers all have the fake stuff. Used to add Calgon to the black tank as a water softener/surfactant, switched to TSP as it works better, is cheaper, and does less environmental damage.
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Old 11-19-2020, 05:43 AM   #14
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my 5er is 18 years old. Never been cleaned. Still going strong.
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