when i used 10% hts i tried it in my e-flow and thought i was going to die it was so strong, so i wouldn't recommend that..i also find the 7% is difficult to tolerate for more than 30 seconds if that long. i just use the pari with 7%because i don't have any 3% right now but my doc said its just fine to use the HTS in the e-flow, just be sure to wash it really well or even have a separate chamber to use just for hts, (but still wash it really well. i'm not sure that was all that helpful but thught i'd throw it out there!