A wand, as several posters have claimed work so well won't work at all when you have macerator toilets (two bathrooms) that are installed in slides where the outflow of the toilet goes through the grinder, then a longish flexible hose and then into the black tank.
Chemicals, like Rid-X and others are the only option if you want the gauges to work, even the Geo Method is adding "chemicals" to the tanks. I, for one, like the gauges to work...I like the gas gauge to work, I like the amp meter to work and I like my tank level indicators to work. Yes, I can guesstimate for all of them (I know how much fuel the tank holds and I know my mileage per gallon), but, having the gray tank back up while I'm taking a shower doesn't cut it for me if the DW has run the dishwasher a couple of extra times without me noticing and my toilets, the type and the way they are plumbed, don't burp (I won't go into how I know) and the gauges help to keep things "running" just fine.
So, thanks to the OP. Always nice to find good reviews of a product.
