Worst is the situation, when you have to call a plumber water, a possibility of bacterial growth layers developing within a PEX pipe is real. It requires regular maintenance and good choice problem is that it cannot be used for outdoor plumbing. So, in case of outdoor plumbing, there is no is coated with an antioxidant material from the inside. You also have too look into aspects like repair that chloride CPVC , as piping material for water transport.
If this doesn't solve it, you can connect a hydraulic bladder drain, but the caustic nature of the chemicals can damage certain kind of... [...]