I know most of you guys have problems with water pressure when trying to setup an under counter reverse osmosis water filter. Many of them require 40 psi or more pressure. My sink faucet only had 20 psi.
Found this booster pump on Amazon.
https://www.amazon.com/dp/B076XXY32R/
This pump works off the 12V battery. Pressure boosted up to 65 psi, which was ideal for my water filter.
I used the filter system below.
https://www.wecofilters.com/gmq-50.html
Compact and neatly fits under the sink of my rv along with some other stuff that I already stocked up there. Has a small 2 gallon tank and a drinking water faucet.
Right now, I'm filling up the tank manually by powering the pump when I need to. Back-flow is prevented by using a check valve installed on the 1/4" water line feeding the filter. I'm planing on automating this later on by installing a solenoid and high/low pressure switches. Will keep you guys updated.