I'm relatively new to this forum and I hope that this thread hasn't gone stone-cold. I just stumbled across it when researching a fix for my diy auto acid dosing system. I've been auto dosing my 16K gallon in-ground plaster pool with liquid CL for a couple years now. My setup is with a really inexpensive 12 vdc rheostat-speed-controlled peristaltic chemical feeder pump and a 24-hr timer. I have a 15 gallon HDPE poly bottle in my pool-shed that I fill from the gallon jugs I get from home-depot every three or four months. Super simple! The timer is set for around midnight to run the CL feeder pump for fifteen minutes and injects about 25 oz. in my chlorinator while the filter pump is running at high speed for cleaning at night. I have an in-floor cleaning system. My CL is steady at about 3 ppm and life is almost good. My pH is always going up cause of my sanitizing method. Every other day or three, I have to add about 2 to 3 cups of 30% MA to keep my pH around 7.6 [it cycles between about 7.9 to 7.5]. My TA has been pretty good as it stays around 80 ppm and I only have to add a few pounds of baking soda every couple of months.....almost no bother. However, to advance my pool automation endeavor, a few weeks ago, I got another peristaltic pump and timer set up to inject acid during the day when my filter pump is running at slow speed to circulate and filter. After about a week, I found that my acid injection system tubing failed causing air to leak into the peristaltic pump suction. Turns out that the silicone tubing is not recommended for use with MA. Not much information is in any of the swimming pool forums about what tubing materials should be used with MA and peristaltic pumps. I've seen the Pentair system and the Stenner pump setups that some have been using but no one discusses what kind of chemical tubing is in their system(s), and they are really pricey compared to my diy setup. I recall someone mentioning using something like the cheap poly 1/4" drip line tubing but no one followed up with a go or no on it. My research led me to Viton tubing which is pretty expensive for me to experiment with unless someone else has good experience to support it. Can anyone advise on what tubing they know is compatible with MA and flexible enough to run thru my 1/8" od peristaltic pump? THX in advance for any thoughts or enlightenment.
fc for your cya to avoid algae. Flirting with minimum is not recommended. 
