Isopure Water (ISO-5PK) Universal Reverse Osmosis (RO) 5 Filters Plus Membrane Replacement Set
Universal Reverse Osmosis 5-Filter Plus Membrane Replacement Set (ISO-5PK)
Everything you need to restore your RO system to factory-fresh performance. One membrane, four filters, full compatibility with standard reverse osmosis housings.
Five stages of filtration working in sequence to remove sediment, chlorine, dissolved solids, and tastes
5-Micron Sediment Pre-Filter
Captures rust, silt, and particulates before they reach the membrane. Extends system life and protects downstream components from clogging.
Carbon Block Filter
Removes chlorine, volatile organic compounds, and chemical contaminants. Protects the RO membrane from oxidative degradation and extends its service life.
RO Membrane Element
The heart of the system. Removes up to 99% of dissolved solids, heavy metals, fluoride, nitrates, and other microscopic contaminants down to 0.0001 microns.
GAC Cartridge Filter
Granular activated carbon stage reduces residual tastes and odors. Polishes water before it reaches the membrane for better taste and cleaner operation.
Post-Inline GAC Filter
Final polishing stage removes any remaining taste or odor from the storage tank. Ensures every glass tastes clean and fresh.
Fits standard reverse osmosis systems with conventional housing sizes
This ISO-5PK replacement set is compatible with the Isopure Water ISO-RO5, ISO-RO4DI, W-525, W-425, and most standard under-sink reverse osmosis systems using 10-inch filter housings and 1/4-inch NPT connections. Verify your existing system uses standard cartridge sizes (2.5" x 10" for sediment and carbon stages) before ordering. Note that 1/4-inch NPT fittings measure approximately 0.540 inches in actual diameter when measured with a ruler, not 0.25 inches.
Replace on schedule to maintain water quality and flow rate
Sediment and Carbon Pre-Filters
Replace the 5-micron sediment filter, carbon block, and GAC cartridge annually, or sooner if you notice reduced flow rate or pressure. Heavy sediment conditions may require more frequent changes.
RO Membrane Element
Replace the reverse osmosis membrane every 2 years under normal use, or when TDS readings increase significantly. Pre-filter maintenance directly impacts membrane lifespan.
Post-Inline GAC Filter
Replace annually to maintain fresh taste. This final polishing stage has less demand than pre-filters but still accumulates organic compounds over time.
Complete System Service
This 5-piece set provides everything needed for a full annual service. Replace all components together to restore your system to like-new performance and water quality.
Complete Kit
One membrane, four filters. Everything arrives together so you can service your entire system in one session.
Universal Fit
Standard sizing works with most conventional RO systems. No proprietary cartridges or brand lock-in.
Better Value
Buying the complete set costs less than purchasing each component individually. Smart maintenance planning saves money.
NPT Connections
Standard National Pipe Thread fittings ensure leak-free installation. Remember that 1/4-inch NPT measures 0.540 inches actual diameter.
Universal Reverse Osmosis 5-Filter Plus Membrane Replacement Set (ISO-5PK)
Everything you need to restore your RO system to factory-fresh performance. One membrane, four filters, full compatibility with standard reverse osmosis housings.
Five stages of filtration working in sequence to remove sediment, chlorine, dissolved solids, and tastes
5-Micron Sediment Pre-Filter
Captures rust, silt, and particulates before they reach the membrane. Extends system life and protects downstream components from clogging.
Carbon Block Filter
Removes chlorine, volatile organic compounds, and chemical contaminants. Protects the RO membrane from oxidative degradation and extends its service life.
RO Membrane Element
The heart of the system. Removes up to 99% of dissolved solids, heavy metals, fluoride, nitrates, and other microscopic contaminants down to 0.0001 microns.
GAC Cartridge Filter
Granular activated carbon stage reduces residual tastes and odors. Polishes water before it reaches the membrane for better taste and cleaner operation.
Post-Inline GAC Filter
Final polishing stage removes any remaining taste or odor from the storage tank. Ensures every glass tastes clean and fresh.
Fits standard reverse osmosis systems with conventional housing sizes
This ISO-5PK replacement set is compatible with the Isopure Water ISO-RO5, ISO-RO4DI, W-525, W-425, and most standard under-sink reverse osmosis systems using 10-inch filter housings and 1/4-inch NPT connections. Verify your existing system uses standard cartridge sizes (2.5" x 10" for sediment and carbon stages) before ordering. Note that 1/4-inch NPT fittings measure approximately 0.540 inches in actual diameter when measured with a ruler, not 0.25 inches.
Replace on schedule to maintain water quality and flow rate
Sediment and Carbon Pre-Filters
Replace the 5-micron sediment filter, carbon block, and GAC cartridge annually, or sooner if you notice reduced flow rate or pressure. Heavy sediment conditions may require more frequent changes.
RO Membrane Element
Replace the reverse osmosis membrane every 2 years under normal use, or when TDS readings increase significantly. Pre-filter maintenance directly impacts membrane lifespan.
Post-Inline GAC Filter
Replace annually to maintain fresh taste. This final polishing stage has less demand than pre-filters but still accumulates organic compounds over time.
Complete System Service
This 5-piece set provides everything needed for a full annual service. Replace all components together to restore your system to like-new performance and water quality.
Complete Kit
One membrane, four filters. Everything arrives together so you can service your entire system in one session.
Universal Fit
Standard sizing works with most conventional RO systems. No proprietary cartridges or brand lock-in.
Better Value
Buying the complete set costs less than purchasing each component individually. Smart maintenance planning saves money.
NPT Connections
Standard National Pipe Thread fittings ensure leak-free installation. Remember that 1/4-inch NPT measures 0.540 inches actual diameter.
Original: $44.99
-65%$44.99
$15.75Description
Universal Reverse Osmosis 5-Filter Plus Membrane Replacement Set (ISO-5PK)
Everything you need to restore your RO system to factory-fresh performance. One membrane, four filters, full compatibility with standard reverse osmosis housings.
Five stages of filtration working in sequence to remove sediment, chlorine, dissolved solids, and tastes
5-Micron Sediment Pre-Filter
Captures rust, silt, and particulates before they reach the membrane. Extends system life and protects downstream components from clogging.
Carbon Block Filter
Removes chlorine, volatile organic compounds, and chemical contaminants. Protects the RO membrane from oxidative degradation and extends its service life.
RO Membrane Element
The heart of the system. Removes up to 99% of dissolved solids, heavy metals, fluoride, nitrates, and other microscopic contaminants down to 0.0001 microns.
GAC Cartridge Filter
Granular activated carbon stage reduces residual tastes and odors. Polishes water before it reaches the membrane for better taste and cleaner operation.
Post-Inline GAC Filter
Final polishing stage removes any remaining taste or odor from the storage tank. Ensures every glass tastes clean and fresh.
Fits standard reverse osmosis systems with conventional housing sizes
This ISO-5PK replacement set is compatible with the Isopure Water ISO-RO5, ISO-RO4DI, W-525, W-425, and most standard under-sink reverse osmosis systems using 10-inch filter housings and 1/4-inch NPT connections. Verify your existing system uses standard cartridge sizes (2.5" x 10" for sediment and carbon stages) before ordering. Note that 1/4-inch NPT fittings measure approximately 0.540 inches in actual diameter when measured with a ruler, not 0.25 inches.
Replace on schedule to maintain water quality and flow rate
Sediment and Carbon Pre-Filters
Replace the 5-micron sediment filter, carbon block, and GAC cartridge annually, or sooner if you notice reduced flow rate or pressure. Heavy sediment conditions may require more frequent changes.
RO Membrane Element
Replace the reverse osmosis membrane every 2 years under normal use, or when TDS readings increase significantly. Pre-filter maintenance directly impacts membrane lifespan.
Post-Inline GAC Filter
Replace annually to maintain fresh taste. This final polishing stage has less demand than pre-filters but still accumulates organic compounds over time.
Complete System Service
This 5-piece set provides everything needed for a full annual service. Replace all components together to restore your system to like-new performance and water quality.
Complete Kit
One membrane, four filters. Everything arrives together so you can service your entire system in one session.
Universal Fit
Standard sizing works with most conventional RO systems. No proprietary cartridges or brand lock-in.
Better Value
Buying the complete set costs less than purchasing each component individually. Smart maintenance planning saves money.
NPT Connections
Standard National Pipe Thread fittings ensure leak-free installation. Remember that 1/4-inch NPT measures 0.540 inches actual diameter.
