First of all.... Congrats on using the Geo Method
You will find it will prove to be very effective and economical
I have used the Geo Method for years, on several different rv's.
Solved problems like
- odors , clogged sensors - removed scum on sides of tanks, and more.
The Method's main ingredients are Laundry detergent (powdered) and
water softener (powdered) FYI... I buy the cheapest laundry soap and use the water softener sparingly, as I find it does not have to be used too it's fullest every time.
IMO.... The laundry soap provides the fragrance and cleaning where as the softener provides a slippery film that adheres to the tank sides, both are powder which break down over time.
There have been some using a 'liquid' softener and I do believe have had some good success with it.
: "has anyone put liquid fabric softener in black tank & what were the results?"
It does sound like it may have the same results....However, I personally have not tried it 'yet'....but I just may do so.
The whole thing about 'holding tanks' they are just that...and never are meant to be 'septic tanks'..as all those Expensive RV chemical pushers would lead you to believe. ...IMO... I do not believe that 'any' of those chemicals "break-down
" the solids in a 3 or 4 day period...waste of money!
Hope this helps
'07 WildCat 30 RLBS ~ West Coast Edition ~
Trail Air - Tri Glide Pin Box
2000 F350 DRW 7.3 Diesel Lariat 89k miles
Edge programmer, 4" SS exhaust turbo/back
Vancouver Island, B.C., Canada