Well FWIW I tried Happy Campers a few years ago and found it didn't work at all. :( To be fair, I seem to recall that to work effectively Happy Campers needs time to work, time I probably didn't give it as I service my tanks here at the house using my Poop Cannon after each trip. I now instead use Walex Porta Pak which has proven effective regardless of how briefly it may be in the tank. Frankly, as long the product I'm using doesn't contain formaldehyde I really don't care what's in it as long as it works ... and Walex Porta Pak has for me. :B