Low pressure due to low flow?

[john98266]

HELP!  My system is a 78' well with a 1/2hp F&W 11GPM pump at 70'.  I have a CSVS125-1 installed in the well at the pitless adapter.  The pipe from the well to the manifold is 195' of 1-1/4" Pex.  Past the manifold is a Kinetico water softener system.  From there, there is a 1" poly pipe approx 50' to the 3/4" connection under my manufactured home.  The CSV is set for 50lbs and the pressure cut-off is at 40-60lbs.  I have checked the pressure at the hose bib in my shop (where the manifold and softener systems are) and it is 60psi.  The flow at the hose bib in the shop is about 6gpm. When I turn on the faucet to water the lawn, the pressure drops to 40psi or lower if any other water is being used.  This is a new home and I'm not sure where to start looking.  Maybe a bigger pump?  The wiring was installed to handle the amperage.  I'm open to all suggestions.

[Cary Austin]

I suspect the softener or filter.  Can you put them in bypass and try again?

[john98266]

Thanks but I bypassed them with virtually no change in the flow.

[Cary Austin]

I think it is going to depend on your pumping level.  From 60' deep that pump can only do about 8 GPM at 50 PSI.  When the pressure gets below 50 PSI the CSV just opens up like a piece of pipe and you are getting whatever your pump can deliver from whatever water level it is working with.  A gouge before the CSV would confirm this for you.