- Saddle valves, drain
- Saddle valves, feed
- Sand
- Scale prevention systems
- Sea tech fittings
- Sea tech maniflods
- Sediment cartridges, pentek
- Sediment media
- Separators
- Shower filters
- Shut off valves, auto
- Shut off valves, flowmatic
- Shut off valves, john guest
- Smart pump for repressurization
- Softener mate
- Sota ash
- Spare parts, flowmatic RO systems
- Spare parts, hydro-safe
- Specialty cartridges, media
- Specialty cartridges, pentek
- Spin-down filters
- Spouts, counter top
- Stainless steel bag filters
- Stainless steel bolt sets
- Stainless steel filter housings, commercial
- Stainless steel filter housings, industrial
- Stainless steel filter housings, in-line
- Stainless steel flex hose
- Stainless steel jackets
- Stainless steel membrane housings
- Static mixers
- Steel mineral tanks
- Switches, pressure
