Return pressure

[Grated]

I had a 200lb ranger series sand filter with a jacuzzi slr 1.5hp pump. The filter starting leaking and a buddy of mine had a hayward pro series S244T 300lb sand filter he was not using. I installed it but now I have a very weak return pressure. The filter pressure gauges reads about 22psi. I backwashed and rinsed after the new Sand was installed. What can cause this?

 

[Grated]

After some more troubleshooting if the selector valve is in recirculation mode the pressure drops to 14 and has tons of return pressure. Now what?

 

[Grated]

Also there is not as much flow when on rinse and backwash as usual.

 

[Grated]

Anyone?

 

[Grated]

I think I am going to try and swap out the laterals from my old filter. The old filter had larger laterals. The new one has the smaller umbrella style.