STAGES: STAGE 1 - Sediment Pre-Filter (41400008) - Replace Every 12 Months STAGE 2 - RO Membrane CTA 9 GPD (41400001) - Replace Every 24 Months STAGE 3 - Carbon Block Post Filter (41400009) - Replace Every 12 Months The Arrowhead Puritap RO system is an obsolete system that filters your water in 3 stages. Sediment, chlorine, taste and odor are reduced by the sediment and carbon filters, and impurities larger than .001 microns are filtered out by the CTA RO membrane.

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