I'm looking for flexible clear tubing to use for transferring RODI and saltwater from my mixing station. I have barbed fittings that are supposed to be 1/2". I have some 1/2" clear tubing from a siphon setup that came with a used tank and it is great except it doesn't fit the barbed fittings. I went to Lowes and bought some 5/8 that fits the barbed fittings perfectly. However it is junk and kinks so bad everywhere that I have to hold it up or the water stops. I found a couple aquarium places online that sell 5/8 tubing but I don't want to end up with more of the same junk I got at Lowes. Hoping that someone could recommend a source for heavier thickness in 5/8.