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FUNCTION

INSTALLATION

Models: THERACLEAR 255 
(Clamp down multiport valve in 50mm)

THIS FILTER OPERATES   UNDER HIGH PRESSURE.  WHEN ANY PART OF THE CIRCULATING
SYSTEM (e.g., CLAMP, PUMP, FILTER, VALVES, ETC.) IS SERVICED, AIR CAN ENTER THE
SYSTEM AND BECOME PRESSURIZED . PRESSURIZED AIR CAN CAUSE THE LID OR VALVE TO 
BE BLOWN OFF WHICH CAN RESULT IN SEVERE INJURY, DEATH, OR PROPERTY DAMAGE
TURN PUMP OFF BEFORE CHANGING VALVE POSITION.

WARNING

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TO PREVENT DAMAGE TO THE PUMP AND FOR PROPER OPERATION OF THE SYSTEM, 
CLEAN PUMP STRAINER AND SKIMMER BASKETS REGULARLY.

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Valve Position

Function

DO NOT UNSCREW SCREWS OF FLANGE CLAMP WHILE PUMP IS RUNNING. 

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FUNCTIONS OF VALVE POSITIONS

WASTE

FILTER

BACKWASH

RINSE

WASTE

RECIRCULATE

CLOSED

WASTE

WASTE

WASTE

WASTE

WASTE

IN FLOW OUT FLOW

IN FLOW OUT FLOW

IN FLOW OUT FLOW

IN FLOW OUT FLOW

IN FLOW OUT FLOW

IN FLOW OUT FLOW

GENERAL

TO ASSEMBLE:

The filter uses special filter sand to remove dirt particles from pool water.  The filter sand is loaded into the filter tank and functions as 

a permanent dirt removing media. When the control valve is in the FILTER position, the pool water which contains suspended dirt 
particles, is pumped through your piping system and is automatically directed by the patented filter control valve to the top of the filter 
tank. As the pool water is pumped through the filter, dirt particles are trapped by the sand bed, and filtered out. The cleaned pool water is 
returned from the bottom of the filter tank, through the control valve and back to the pool through the piping system.  This entire sequence 
is continuous and automatic. It provides for total recirculation of pool water through your filter and piping system.

 After a period of time, the accumulated dirt in the filter causes a resistance to flow, and the flow diminishes.  This means it is time to 

clean your filter.  With the control valve in the BACKWASH position, the water flow is automatically reversed through the filter so that it 
is directed to the bottom of the tank, up through the sand, flushing the previously trapped dirt and debris out the waste line. Once the filter 
is back-washed of dirt, set control valve to RINSE position and run pump for about 1/2 to 1 minute, and then set the control valve in the 
FILTER position, to resume normal filtering.

NOTE: Turn pump off  before changing valve position.

Only simple tools (screwdriver and wrenches), plus pipe sealant for plastic adapters, are required to install and
service the filter.

1. The filter should be placed on a level concrete slab, very firm ground, or equivalent. The filter should be placed 

2. Loading the sand media.  Filter sand media is loaded through the top opening of the filter.

a. Loosen the flange clamp and remove filter control valve (if previously installed).
b. Cap internal pipe with plastic cap to prevent sand from entering it.
c. We recommend filling the tank approximately 1/2 way with water to provide a cushion effect when the filter 

d. Carefully pour in correct amount and grade of filter sand.  (Be sure center pipe remains centered in opening.)

internal pipe.

in the right position so that the piping connections, control valve are convenient and accessible for operation and service.

sand is poured in. This helps protect the under-drain laterals from excessive shock.

Sand surface should  be leveled and should come to about the middle of the filter tank. Remove plastic cap from

SERVICING VALVE( Stop pump,close gate valve in suction&discharge before proceeding):
    a. Set handle in filter position.   b. Remove cover screws.   c. Lift cover and key assembly out.

1. Place valve key so that wedge opening is at TOP port (handle in Filter psn.).  Flat edge of cover screw lug should align with 

flat edge of body screw lug.

2. Position cover o’ring.
3. Secure assembly to body with cover screws.  Tighten cover screws evenly and alternately.  Do not over-tighten.

FILTER 
BACKWASH 
RINSE
WASTE 
RECIRCULATE
CLOSED 

Normal Filtration and Vacuuming
Cleaning Filter by reversing the flow
Used after backwash to flush dirt from valve
By-passes filter, used for vacuuming to waste or lowering water level
By-passes filter for circulating water to pool
Shuts off all flow to filter or pool

TLFI13070818

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