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Frequently asked questions

Membrane size needs to match your existing RO housing — check your housing's spec or the membrane you're replacing before ordering, since a mismatched diameter simply won't fit, regardless of the rejection or production rating.

Rejection rate is the percentage of dissolved solids the membrane blocks from passing through — Spectrum's higher-rejection membranes remove more of the total dissolved solids in your water, at the cost of somewhat lower output flow compared with high-production membranes.

Typically 12–24 months for domestic use, depending on incoming water quality and how well the upstream pre-filters are maintained — a well-protected membrane (good sediment and chlorine pre-filtration) will outlast a poorly protected one significantly.

High rejection membranes are optimised to remove the maximum percentage of dissolved solids; high production membranes prioritise output volume, useful where you need more filtered water faster and can accept a marginally lower rejection rate. Choose based on whether purity or output speed matters more for your application.

Yes, the membrane and pre-filter cartridges are independent consumables and are typically replaced on different schedules — pre-filters more often (6–12 months), the membrane less often (12–24 months) — so replacing one doesn't require replacing the other unless it's also due.