Black Water Tank Issue

stickdog wrote:

Kiz wrote:
This neophyte needs help from those more experienced, and I apologize for the novel. My unit is a park model stationery RV. At the end of last season, my black tank plugged on a Friday evening when all RV places were closed, so I went on the advice of the local hardware store who sold me a drain cleaner, supposedly safe for setptic fields, and they assured me would not harm my system. Long story short, the toilet 'melted', and the black tank is not holding water. When I fill it up, it drains within about 10 minutes. There is no water in the underbelly. I had the toilet replaced when the unit was winterized, and they told me it should fix the black tank issue as well. However, I am thinking that I likely melted the black tank valve as well, and should probably have this replaced before using.... what are the thoughts of those more experienced?

I'm not familiar with park models but I was under the impression they were connected to the sanitary drain without a black or gray tanks.

Bingo TRUE PARK models have no holding tanks. AND, they usually have residential type toilets but not always. Since he has NO water coming out anywhere, that shows he has no tank and his system is functioning as designed. AS to using Draino and such, about 35 years ago I had a customer bring his Motorhome in for toilet draining problems. I had to pull the toilet. As I lefted the toilet and carries it out of the motorhome liquid splashed all over the carpet and on my work jeans. Once outside my legs started to burn. I looked down and my jeans were dissolving. I quickly pulled off my jeans and washed my legs down luckily no harm to my legs. I walked back inside his Motorhome and his carpet was dissolved every place the liquid hit. I called the customer and he had no idea what was in the toilet. Then he called the next day and admitted he rents out the motorhome and the previous renter poured the drain cleaner in the toilet. Customer had an expensive lesson in renting and not what to do with an RV toilet. Doug

PS, 15 years ago after Hurricane Katrina, we had a lot of potential customers call us to add Fresh/Gray/Black tanks to the very used FEMA Park Model trailers FEMA supplied to the victims. They bought the trailers for what they thought was a great price and then found out they were NOT self Contained RV trailer models.