Add a bell reducer to the pipes. where the water goes in. the water hitting this will cause an increase in water pressure in the pipe. it makes a venturi action
Just to say , if you use funnels or 2inch pipe , or 5 inch pipe ..... It will NOT make the pressure bigger it just dont work like that
That's what I've been afraid of. I was thinking about just putting a small bell reduce on the end of my pipes
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just to increase the pressure slightly but not over power it.