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Frequently asked questions

A wound filter (also called string wound) is made by winding yarn — cotton or polypropylene — around a core in a controlled pattern that creates graduated density, coarser on the outside and finer near the core, so it captures sediment throughout its depth rather than just on the surface.

Wound filters excel at handling heavy, variable sediment loads — like untreated borehole or well water — without clogging as quickly as a pleated cartridge would, because the graduated depth structure has more capacity to hold dirt throughout its thickness rather than just at the surface.

Polypropylene is the general-purpose choice for water filtration since it resists bacterial growth better than natural cotton. Cotton is chosen for specific applications like oil and hydrocarbon absorption, where its natural absorbency is an advantage.

Spectrum's wound filters span a wide range from very coarse to fine ratings, so they can be used as an aggressive first-stage pre-filter or as a finer polishing stage — check the specific product listing to match the rating to your water condition.

Single-use. Because sediment is trapped throughout the depth of the wound fibre rather than just on the surface, wound filters can't be effectively cleaned and reused — replace the cartridge once flow drops or pressure differential rises.