Step 1: Make sure that the water supply to the filter system is off.
Step 2: Remove the old cartridges. Note: If using a manifold system with an HF8-S scale inhibition cartridge, the
cartridge should be left in place.
Step 3: Add liquid disinfectant to the flushing cartridge through the center straw using a basting syringe. These
syringes are readily available but 3M also offers one p/n 5622001 (70020189018). See illustration below.
NOTE: If the filter system is an older CUNO™ SystemOne manifold with a drop-in style
prefilter, a flushing cartridge is not required. The disinfectant should be added directly into
the prefilter sump.
Step 4: Once the flushing cartridge is filled with disinfectant, it is inserted into the filter
head. If cleaning a multi-head manifold, the flushing cartridge should be inserted into the
first head and plugs should be inserted into the remaining heads. Note: on DF manifolds,
two flushing cartridges are required.
Step 5: Open incoming water supply to the filter and open a downstream valve or faucet. Be sure to open
a downstream faucet on all outlet lines from the filter system. When a strong chlorine smell is evident in the
downstream valves or faucets, shut the water flow and let the sanitizing solution soak for at least 30 minutes. After 30
minutes, the water should have a slight chlorine odor. If not, repeat the dosage/steps and allow the water to stand for
an additional 15 minutes.
Step 6: Flush out the disinfectant from the filtration system by flushing water through the system for 5 minutes using
potable water from the water-main. Close the incoming water supply and reopen all downstream faucets to relieve
the water pressure on the system.