My pumping system for acid injection uses what appears to be polyethylene tubing from the pump to the injection port. After about a year of use the tubing seems to be a little brittle and is cracking where it attaches to the pump. Is the polyethylene tubing the best option or would I be better off using something else that is more UV resistant... Santoprene? I assume the tubing in the pump itself is santoprene, is there any reason not to use it for the supply tubing as well?