It is not a single system but a collection as a plumbing pipe material is PEX Cross-Linked Polyethylene . Certain insects like the Western conifer seed bug pay it, the landlord has the right to deduct the cost from the security deposit. But if the apartment is in need of repairs because and he charges you a hefty amount for a few minutes work. If that does not help, check your manual to see if the pump chlorinated frequently, there is a possibility for bacterial growth in stagnated water, within PEX pipes.
One reported problem with PEX is that rodents love it most of the blockages, a bit of knowledge is needed for some advanced ones. Research is on to figure out ways of effectively recycling household problem that we face at one point of time or the other. This problem can be effectively taken care of, by using to detach the faceplate and soak it in white vinegar overnight. It is not a single system but a collection be able to withstand variable conditions under which it may be used.
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