I know this is an older thread, but I just have to say THANK YOU to Ted for posting it! I completed "The Ted Treatment" early this summer, and was amazed at how quickly it worked. In my case, my goal wasn't to necessarily clean the tank walls (I can't even see the tank), but rather to get rid of the God-awful smell that came out of the vent after flushing, a problem I've been putting up with for a few years. My vent is located near the bow of the boat, and of course we (and our guests) relax on the aft sundeck. 99% of our time is spent on a mooring or at anchor vs. dockside, so of course we're always sitting downwind of the vent. It got to the point where my wife was so embarrassed by the smell, she would make everyone walk up to the bow of the boat and, once in position, she would go and make the flush. Then she'd circle the sundeck, give the "all clear", and only then could we go back and sit down, lol.
I didn't use nearly the volume of "concoction" that Ted did, but I mixed it in the same way. I added maybe 10 gallons of the stuff through the pumpout port to my empty tank. I let it sit for about 2 weeks while I was away, and I was shocked to find the flush smell completely gone the next time I returned to the boat! I hadn't even pumped the remaining slurry out yet! Since then, I add about a Tbs of the Sodium Percarbonate down the Vaccuflush each day we use the boat, and so far this summer - no smell at all! I mean NO smell! I'm amazed (and thankful).
As I ordered 25 pounds of the SP, I have a lot leftover. I recently purchased a bulk pack of 1 pint Rubbermaid containers with a spout. I keep one in each bathroom filled with the SP, and have started giving the others away as gifts to boating friends, lol.