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I assume you mean backwash the filter. The pump will always pump in one direction.
I am also assuming that you have a sand filter with a filter control valve.
If your filter's waste discharge needs a hose attached to route the discharge to a ditch or other suitable location, be sure to attach the hose before beginning this process.
Turn the pump off. Set the filter control valve to the backwash position. Turn the pump on and run for 30 sec to 1 minute until the water being discharged looks clear. If your filter control valve has a Rinse setting, turn the pump off, set it to Rinse and run the pump for about 30 sec. Turn the pump off. Set the Set the filter control valve back to Filter and turn the pump back on.
make sure filter grids where cleaned with TSP tri sodium phosphate to degrease them then recharge system filters are locked or try on recirculate if ok then clean filters if not pump seals getting hot and pump not working correctly
The link has a set-up video for the 637R pump. Make sure water flows out of the air valve on the top of the filter cover. This will purge air out of the filter and prime the pump. Hope this helps you....
VALVE SETTINGFUNCTIONS OF VALVE POSITIONSFLOW DIRECTION THROUGH VALVEFILTER
PUMP - TOP - THROUGH FILTER - BOTTOM - RETURN
For normal filtration and vacuuming pool through filter.
PUMP - BOTTOM - THROUGH FILTER - TOP - WASTE
For reversing flow for cleaning filter.
PUMP - TOP - THROUGH FILTER - BOTTOM - WASTE
For initial start-up cleaning, plus resetting filter bed after backwashing.
PUMP - WASTE
For vacuuming directly to waste, lowering pool level/draining pool.
NO CIRCULATION PAST PUMP PORT
For shutting off all flow to filter and pool.
PUMP - RETURN
For bypassing filter, but circulating pool water. May be plumbed for "off-system" pool
water access. Ideal for Jet-Air® fittings.
VALVE NOT IN USE Ifthis answer does not fix your problem, please comment with additional detailsprior to rating the answer. Positive feedback is appreciated once your problemis solved! Thank you.
You will simply remove the old sand from your pool filter and follow the instructions from your users manual like you are adding sand for the first time. In case you don't have it, I am going to paraphrase it for you below.
1. Be sure correct amount of filter sand media is in tank and
that all connections have been made and are secure.
IMPORTANT: To prevent unnecessary strain on piping system and valving, always shut off pump before switching Filter Control Valve positions.
The correct amout of sand can be determined with this link: http://www.backyardcitypools.com/pool-filters/Filter-Sand-Requirements.htm
2. Set your controls to the backwash position.
3. Prime and start pump according to pump instructions. (be sure all suction and return lines are open), allowing the filter tank to fill with water.
4. Once water flow is steady out the waste line, run the pump
for at least 2 minutes. This initial backwashing of the filter is recommended to remove any impurities or fine sand particles in the sand media.
5. Turn pump off and set valve to RINSE position. Start pump and operate until water in sight glass is clear—about 1/2 to 1 minute. Turn pump off, set valve to FILTER position and restart pump. Your filter is now operating in the normal filter mode, filtering particles from the pool water.
6. Adjust pool suction and return valves to achieve desired
flow. Check system and filter for water leaks and tighten connections, bolts, nuts, as required.