My pool pump pumps water, return is low pressure

A weak pool jet is one of the most frequent problems for pool owners. If you ask a pool professional “Why are my pool jets not working?”, you may receive a blank stare and a pause. This reaction is due to the fact that we know the solution could be simple, but narrowing it down is time-consuming. We’ll separate the cause of low pool jet pressure into two parts. This will hopefully save you time from reading a section that doesn’t pertain to your situation. Part I will discuss low jet pressure when the filter gauge has a low PSI reading. In Part II we’ll discuss low jet pressure when the filter gauge has a high PSI reading.

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what you may have is a blocked outlet--filter --tap incorrectly set
good pressure but no suction indicates that the pump is pumping but the pumped water has nowhere to go

Check to make sure the ball in the inlet and the outlet valve has not moved. If it is a plastic type plumbing one the ball can actually fall out of the the housing.
Personally I do not own a sand filter my pool came with a DE type.(6 of one a half dozen of the other). I would remove all the sand from the filter and see if the pump works as you think it should. After that it is a matter of figuring out the obstruction. Could be valves leaves, almost anything but it should be easy to locate.

Low water volume will cause low pressure. Check for any obstructions in the suction libe and/or minor leaks that will cause the pump to **** air. If everything checks out, make sure the water is actually flowing thru the sand. If you suspect the water is bypassing thru the multi-port valve or a tunnel in the sand: pour a cup of flour in the skimmer, if you see it return thru the returns, you have your verification.

NOT THE MOTOR ,THE SEAL... JET PUMPS ARE NOT FOR POOLS.. LOW FLOW HIGH PRESSURE.. YOU NEED HIGH FLOW LOW PRESSURE ... IF NOT YOU MAY HAVE A SUCTION LEAK OR A BAD SHAFT SEAL... VOTE JAY

I happen to have a copy of the users manual for this pool filter. These are the instructions for operating your filter.

1. Be sure correct amount of filter sand media is in tank and
that all connections have been made and are secure.
2. Depress Vari-Flo control valve handle and rotate to
BACKWASH* position. (To prevent damage to control valve
seal, always depress handle before turning.)
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.
WARNING: ALL SUCTION AND
DISCHARGE VALVES MUST BE OPEN WHEN
STARTING THE SYSTEM. FAILURE TO DO
SO COULD CAUSE SEVERE PERSONAL
INJURY.
Once water flow is steady out the waste line, run the pump for
at least 2 minutes. The initial back-washing of the filter is
recommended to remove any impurities or fine sand particles
in the sand media.
4. 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.
5. Adjust pool suction and return valves to achieve desired
flow. Check system and filter for water leaks and tighten
connections, bolts, nuts, as required.
6. Note the initial pressure gauge reading when the filter is
clean. (It will vary from pool to pool depending upon the
pump and general piping system). As the filter removes dirt
and impurities from the pool water, the accumulation in the
filter will cause the pressure to rise and flow to diminish.
When the pressure gauge reading is 8-10 PSI (0.55-0.69
BAR) higher than the initial "clean" pressure you noted, it is
time to backwash (clean) the filter (see BACKWASH under
Filter Control Valve Functions.)

If circulation is better when you pull the cleaner from the water the problem may be in your hose's. With the pump running pull the hose's from the water one at a time to see if you hear air leaking into the hose's and then replace the bad ones. Hope this helps, good luck

That paddle wheel is an impeller. It spins at high speed in order to sling water coming from the pool to the pressure outlet of the pump. The centrifugal force causes pressure to force the water through the filter and then back into the return line of the pool. If there is air in the pump it needs to be primed. One way to do this is to disconnect the return hose from the pool (block the water from the pool so it is not lost on the ground). Let water leak out of the hose so it replaces the air in the pump with water. The hose can be reconnected and the pump started.

Happy pool management.

Very Vague question as far as problems go, I'll try to narrow down.
If the pressure is low on the tank that is a good thing.
If the pressure of the water going back into the pool from the discharge is low/ weak.. it's not.
If the Pump is operating properly, the problem could be the following

1. Extra long filter hoses. Any hose longer then 6ft will decrease the pressure back to the pool.
2. Chlorinater, salt generator or mineral cartridges in line from the filter to the pool may decrease return pressure, as will solar panels.
3. A filter in need of back washing. An older DE or Cartridge filter may need an acid bath. May also be an issue with newer filters that had to battle a bad algae problem. An Acid bath will remove dead algae from the inside of the grids or tubes/ fingers.
4. If you notice bubbles in the water returning into the pool from the eyeball/discharge, or water in the strainer basket is visibly swirling (bubbles visible) odds are you need you replace the o-ring on the lid of the strainer basket in the front of the pump. This basket may also be clogged with debris, which also effect pressure. Could also be a cracked or warped strainer lid. Should be easy to see when you remove to check o-ring.

You have a clogged impeller