Watts Compatible Replacement Water Filters for WP5-50 Reverse Osmosis System w/ Compatible 50 GPD Membrane 560018This complete filter replacement set for the Watts WP5 50 reverse osmosis system includes five critical components: sediment pre filter, two carbon block filters, a 50 GPD membrane, and an inline post filter. All cartridges are standard 10" x 2. 5" drop in format with a 1. 8" x 11. 75" membrane and 10" x 2" inline post filter with 1 4" NPT female threads. SPECIFICATIONS What's Included in This Replacement Set Sediment Filter 10" x 2. 5" Stage 1 pre