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
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