HydroLogic Stealth RO Filter Housing - Clear Sump, Black Cap, 3/8 in FNPT

HydroLogic Stealth RO Filter Housing, Clear Sump

This is the replacement pre-filter housing for HydroLogic Stealth-RO reverse osmosis systems. It pairs a clear sump with a black cap that carries the inlet and outlet ports. The ports are 3/8 in FNPT, matching the threaded fittings on the Stealth-RO manifold. A double O-ring seals the sump to the cap, which keeps the joint tight under line pressure. The same housing holds either the carbon cartridge or the sediment cartridge, so one spare covers both pre-filter stages. Through the clear body you can see the cartridge darken and catch sediment before it chokes flow. That makes it easy to time a filter change by eye rather than by guesswork. Clean pre-filters protect the membrane downstream, which is the most expensive part of the system. A cracked or clouded sump is a common cause of slow leaks at the pre-filter stage. The suggested replacement interval for the housing is about three years. The housing measures roughly 11.75 in tall and just under 5 in across.

Changing a Carbon or Sediment Housing on a Stealth-RO

Shut off the water supply and open a downstream tap to bleed pressure from the system. Set a towel or tray under the filters, since some water will drain when the sump comes off. Unscrew the old sump from the cap and remove the cartridge. Unthread the old cap fittings if you are swapping the full housing, and wrap the male threads with fresh PTFE tape. Thread the fittings into the new cap snugly without overtightening the plastic. Check that both O-rings sit clean and seated in their groove, and add a light film of food-grade silicone grease. Drop the carbon or sediment cartridge into the sump and thread it onto the cap by hand. Turn the water back on slowly and watch the joint for drips over the next few minutes. Run water to drain for a few minutes to flush carbon fines from a fresh cartridge. Mark the date on the sump with a marker so the next change is easy to track. Keep a spare housing on the shelf so a leak never takes your water supply offline.

Key Features

• Clear Sump: See cartridge condition at a glance and time filter changes.
• Black Cap: Carries the inlet and outlet ports.
• 3/8 in FNPT Ports: Threads match the Stealth-RO pre-filter fittings.
• Double O-Ring Seal: Keeps the sump-to-cap joint tight under pressure.
• Carbon or Sediment: One housing serves either pre-filter stage.

Technical Specifications