5
Replacing the Media
1. Shut off the primary water supply going to the OneFlow
®
tank.
2. Open up a downstream spigot or faucet to release pressure
in the tank and in the distribution lines before and after
the system.
3. Close the inlet and outlet isolation valves immediately before
and after the tank and open the bypass valve.
4. Disconnect the unions on the inlet and outlet of the tank,
and then disconnect flex connectors from head.
5. Using a step ladder and strap wrench, remove the threaded
head assembly connection (turning counter-clockwise) and
remove the complete upper assembly including the screen
attached to the bottom of the head assembly. Rinse these
parts in a nearby sink or bucket of water. Do not drain
the tank.
6. Remove the distributor tube with the bottom strainer. Rinse
these parts in a nearby sink or bucket of water.
7. Get a 6ft length of 3/4" sch. 40 PVC and a length of 1" polyvinyl
hose. The length of hose depends on the distance to the
nearest floor drain. (Both of these can be acquired at a local
hardware store.)
8. Insert one end of the pipe inside the hose and put the other
end of the pipe into the top of the tank and down into the
media. Put the other end of the hose inside a rice bag and
put the rice bag on the floor drain.
9. Get a garden hose and put it on the open end of the polyvinyl
hose to fill the hose and pipe with water. Air will bubble out
of the tank. Once all the air is out of the hose and pipe, you
can start a siphon to remove the media. Put the garden
hose in the top of the tank and turn it on to keep the tank
full of water. Push the pipe up and down in the media to get
it all out. The rice bag will catch the media and allow the
water to go down the drain.
10. Try not to be too aggressive when extracting the media.
You need to take it out in small bites. If you let the whole
pipe/hose fill with media it will plug up. You need to let slugs
of water flush out the pipe as you go.
11. When all the old media is removed turn off the garden
hose and continue to siphon until the tank is about half full
with water.
12. Using the step ladder again, reinstall the distributer tube with
bottom strainer that was removed in step #6. Center the
distributor tube in the bottom of the tank. Make sure the
distributor tube is flush with the top of the tank and cap
the top open end of the distributor tube with tape and
plastic sheeting. Keeping any and all media from entering
the distributor tube, carefully pour-in a new bag(s) of media
that specifically meets the replacement requirement of the
tank. For example, an OF1665-75TM system requires (x1)
OF1665RM Replacement Media.
13. Inspect the threaded connection on the top of the tank to
ensure no loose beads of media are stuck to the internal
threads. If visible, wipe away the beads with a damp cloth,
then remove the plastic sheeting and tape from the top of
the distributor tube.
14. Re-attach the head assembly onto the distributor tube and
thread the head assembly back onto the tank. Hand-tighten
until the final turn when a strap wrench can help tighten
the connection.
Your OneFlow
®
media should be replaced every 3 years. Dispose
of old media and/or container in accordance with local, regional,
national, and/or international regulations.
NOTICE
Follow steps 1 – 6 then,
• Remove center distributor tube and lower basket and siphon
all water from tank
• Lay tank down on its side and tip upside down while using
hose to flush media out
• When all the old media is removed, stand tank back up and
install in original position. Fill the tank so that it is about half
full with water.
Then continue with steps 12 – 19.
Alternative Method for
Replacing Media
3/4"
PVC PIPE
1" HOSE
FLOOR DRAIN
BAG
15. Reconnect the flex connectors and union connections.
16. Fully open the primary water supply valve and close the
bypass valve.
17. Slowly open the outlet isolation valve and slightly open the
inlet isolation valve to allow water to flow into the system
and out of a downstream cold side faucet to purge the air
from the tank and plumbing system.
18. Once the tank is full, wait 4 hours for media to “hydrate”.
19. Slowly, fully open the inlet isolation valve. The system is now
ready for operation.
