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Replacing the Media
NOTICE
Ion exchange resin may need to be replaced periodically
due to physical breakdown caused by chlorine/chloramine
disinfectants, or fouling caused by certain metals such as
iron and manganese.
1. Mark the location of the mineral tanks on the floor incase they
need to be moved once all water, resin and gravel has been
removed. This will help with realignment of the plumbing after
media replacement. DO NOT attempt to move a mineral tank
that contains media and or water.
2. Open the bypass valve.
3. Close the inlet and outlet isolation valves for the mineral tank
needing media replacement
4. Locate "Manually Initiating a Regeneration" on page 17 for
NXT2 and page 26 for SXT controllers and follow the steps
to place the system in the backwash position. This relieves
any pressure inside the mineral tank. Once the system cycles
into the backwash position, unplug the control valve from the
power outlet to keep the system in the backwash position.
5. Disconnect the inlet, outlet, and drain union plumbing fittings.
Then, if necessary for the removal of the control valve from
the mineral tank, remove the remaining plumbing from the
inlet, outlet and drain ports of the control valve.
6. Disconnect the meter cable from the from the from the meter
dome and from the NXT2 P5 port or SXT P1 port located on
the back of the control valve controller. Store the meter cable
in a safe location.
7. Disconnect the brine tubing from the control valve's brine
connection port.
8. Disconnect the power supply cable from NXT2 P14 port or SXT
P2PWR port located on the back of the control valve controller.
9. If this is an NXT2 multi-tank system that uses the communi-
cation cable ports, disconnect any interconnecting communi-
cation cables from the P1 and P3 ports located on the back
of the control valve NXT2 controllers.
10. Remove the control valve from the mineral tank by turning
the control valve counter-clockwise when viewed from above.
Keeping a firm grip on the control valve, continue to rotate
until it can be lifted off of the top of the mineral tank. Store
the control valve in a safe location.
11. Note the top of the distributor tube. It must be flush with the
top of the tank. If it is above the top of the tank by more than
1/2" the distributor tube may have become disconnected from
the distributor screen in the bottom of the mineral and must
be reconnected.
12. Obtain a length of 3/4" sch. 40 PVC that is the same height
as the mineral tank and a length of 1" clear braided poly-vinyl
hose. The hose must be long enough to reach the nearest floor
drain. (Both of these can be acquired at a local hardware store).
13. Insert one end of the pipe inside the hose and the other end
of the pipe into the top of the mineral tank and down into
the resin media. Put the other end of the hose inside a water
permeable bag and locate the bag over the floor drain.
14. Insert a garden hose into the bag side of the poly-vinyl hose to
fill the hose and PVC pipe with water. Air will bubble out of the
tank. Once all the air is out of the hose and pipe, remove the
garden hose from the polyvinyl hose to establish a siphon. The
resin can then be siphoned into the bag. Use the garden hose
to maintain a full water level in the mineral tank to. The bag end
of the poly-vinyl hose must remain lower in elevation then the
end of the PVC pipe in the mineral tank to maintain the siphon.
The bag will retain the resin while the water flows down the
drain. Use caution not to allow resin to enter the floor drain.
15. Continue to siphon resin until it is completely evacuated from
the mineral tank. Gravel will clogged the siphon hose and, if
it must be removed due to fouling, or to repair or replace a
damaged distributor tube and screen, must be evacuated by
other means.
16. If replacing gravel, inspect lower distributor screens for dam-
age and replace if necessary.
17. To add new media and reconnect control valve to mineral
tank follow General Installation steps 3-4K located on page 9
of this manual.
18. Reconnect inlet, outlet, and drain plumbing to the control
valve and tighten the plumbing union fittings on each of these
plumbing lines.
19. Reconnect brine tubing to brine connection port of control valve.
20. Reconnect meter cable to meter dome. Then reconnect the
other end of the meter cable to the NXT2 P5 port or SXT P1
port located on the back of the control valve controller.
21. If this is an NXT2 multi-tank system that uses the communi-
cation cable ports, reconnect any interconnecting communi-
cation cables to the P1 and P3 ports located on the back of
the control valve NXT2 controllers.
22. Open the inlet isolation valve slightly, until water can be heard
flowing through the isolation valve and allow the mineral tank
to fill with water. Air will come out of the drain line until the
mineral tank is full of water. Once water flow at the drain line
is observed, fully open the inlet valve and allow water flow
to drain for 10 minutes to flush the resin bed of any color. If
water at the drain shows any discoloration, continue to flush
the resin bed until water at the drain is clear.
23. After resin bed flushing is complete, reconnect the power
supply cable to the NXT2 P14 port or SXT P2PWR port
located on the back of the control valve controller. Plug the
system back in to the power outlet so that it will return to the
service position.
24. Fully open inlet and outlet isolation valves and close bypass
valve.
25. Check for leaks and repair as required.
26. Open hot and cold side of a treated water faucet to flush any
air from the plumbing system.
If this is a multi-tank system replace media in each mineral tank
according to this media replacement procedure.
Bag
Floor
Drain
34
3/4" PVC
hose
1" hose
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