Pentair SM/SMBW 2000 - Manual (Page 13)

7
SM/SMBW 2000 Series™ Filter Installation and User’s Guide
Section 4
Maintenance
To Backwash (Clean) Filter
WARNING — To prevent equipment damage and possible bodily injury and/or property damage, always turn the
pump off before changing the valve positions.
1. Pressure backwashing is accomplished in four easy steps:
a. Turn pump off.
b. Rotate handle of rotary valve 90
o as shown in Figure 2.
STAND CLEAR OF THE FILTER.
c. Turn pump on.
d. Backwash for approximately two minutes or until effluent
appears clean. When backwashing is complete, turn pump
off, rotate handle back to filter position and you are ready for
filter operation again. Precoat filter with D.E. as shown on
page 4, Table 1 .
How to Clean the Separation Tank, performed after each backwash operation. (If installed or if applicable.)
The purpose of the separation tank is to collect the spent diatomaceous earth during backwashing (cleaning) of
the filter. It must be cleaned after each backwash to prevent any clogging problems. It is recommended that this
procedure be repeated to ensure complete backwashing of the filter. One backwashing may not be sufficient.
1. Open valve “C” and valve “D”* to drain separation tank. While the tank drains, the filter can be pre-coated
and restored to the filter cycle. Be sure valve “B” is closed. See Figure 3.
WARNING — *Valve "D" is the air relief valve. It is important that this valve be opened before proceeding
further. The tank is pressurized and is dangerous if the air is not vented prior to removing the lid
clamp. Failure to open the air relief valve could cause the lid to separate resulting is serious bodily
injury and/or property damage.
2. To remove the clamping ring, partially unscrew the adjustment knob and release the head of the T-bolt from
the slotted bracket.
3. Remove tank lid with screwdriver or with a tool available from the manufacturer, see page 9, Figure 5. Avoid
cutting rubber O-ring.
4. When water has drained from bag, remove bag from tank by grasping the handles of the bag with both hands;
pushing down with one hand; pulling up with the other and lifting bag out.
5. Turn bag inside out and empty contents is a waste container. Rinse bag
with garden hose.
6. Install bag in tank with the rim of the bag immediately below the tank
inlet opening, then push down on the rim opposite the inlet opening until
the rim is level.
7. Remove rubber O-ring and clean both O-ring and channel. Lubricate
O-ring with a non-water soluble grease or silicone lubricant and
replace O-ring in channel.
8. Clean the inside surface of the tank lid where it seals against the
O-ring. Place lid on tank; push down on lid to seat in-place.
9. Replace the clamping ring. Engage the head of the T-bolt into the slotted bracket and tighten the adjustment
knob. Hand tighten only.
Figure 2.
Figure 3.