Category
RO filters
8 products — ordered by how often we mention them.
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APEC FILTER-MAX-ESPH Replacement RO Filter Set (with post-filter)
Membrane swap + polishing post-filter when output TDS creeps back up — single purchase covers both.
$80.28
in 1 guide
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APEC FILTER-SET-ES Replacement Reverse Osmosis Pre-filter Set
Replace stages 1–3 once a year (or sooner if pressure drops) on most APEC systems.
$25.46
in 1 guide
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APEC Water FILTER-MAX-ES50 Reverse Osmosis Filter Replacement (50 GPD)
Standard 2-year membrane swap on APEC 50 GPD systems.
$82.89
in 1 guide
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Geekpure 75 GPD NSF Certified Reverse Osmosis Membrane
Standard 75 GPD RO replacement membrane for tank systems — typically swap every 2-3 years
$14.63
in 1 guide
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IPW Industries Universal 4-Stage Under Sink RO Replacement Filter Kit
Illustrating ongoing cartridge cost for a compatible conventional under-sink RO; verify model compatibility first
$39.99
in 1 guide
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iSpring Greatwell NSF/ANSI 58 Certified RO Membrane (75 GPD)
Drop-in 75 GPD replacement for iSpring RCC series and most 75 GPD systems — NSF/ANSI 58 listed.
$36.99
in 1 guide
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Membrane Solutions NSF/ANSI 58 Certified 50 GPD RO Membrane
Lower-waste replacement for 50 GPD systems where membrane pressure or flow is reduced.
$19.99
in 1 guide
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SimPure SP5-RO75 6-Stage 10\" RO Replacement Filter Set
6-stage replacement for SimPure and similar tankless RO systems — covers pre-filters in one kit.
$47.69
in 1 guide