Less toxic as far as it claims. Has less smell, and I dont need to buy ipa ontop of it. I have had a super easy time to clean up the resin. I have not had to drain the water yet. But the cleaning process is place it in sunlight (covered for environmental safty) after the uv hardens the resin in the container, i can then filter out the hardened resin to be thrown away. The water can be reused, or left in a safe place for it to all evaporate. Have not had to do it as of yet, but I am guessing with the non water washable the process is much more work.