Thank you for your reply. Yes, I used beer making silicon tubing. The motomassage still works but occasionally it stops going up and down and restarts if I nudge it. I keep the ph at about 7.4, use silver ion, and non-chlorine shock, temperature is 103F. I'll keep going until it stops. What is it that fails in the tubing that keeps it from going up and down? If you find the source of your tubing, please send it to me. Also, how did you compensate for the thinner tubing at the ends, did you use zip ties? Thanks.