FYI, a client has had a problem with his 3/8" ID airline freezing up. Using one of those tanks, it used less than a quart of alcohol to keep the line thawed. One fill-up was good for 3 years and it probably could have gone through a 4th. I don't know how much was lost each summer.
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).