Boosting Pressure in a Reverse Osmosis Water Filter

How do I boost pressure in a reverse osmosis system?
Installation guide for an electric booster pump retrokit kit (WECO FC-1400) onto a residential under the sink reverse osmosis (RO) water filtration system.
Plumbing and wiring diagrams below at design 1 using asv valve:
www.wecofilter...
Retrofit pump kit available on Amazon
www.amazon.com...

[@DB-bj5wv]

Can you use these if you have ZERO pressure because you're feeding the water from an open tank rather than from a pressurized water line?

[@barrywilliams8743]

I would like to know too!!!
2years and no one has replied

[@OldLadyGamersince1990]

From what i know. There are 2 types of pumps, the one with required inlet pressure (30 psi and above) and the one with self priming which necessary for 0 psi pressure.

[@user-qi1od3xu4g]

مساء الخير لك للمتابعين. كيف يتم اعطار امر تشغيل وفصل الماتو الأول. ما هي القطعة التي تم تركيبها على مدخل المرحله ٣.شكرا

[@OldLadyGamersince1990]

Ugly installation. The one that assembled by a lady is much better :) th-cam.com/video/MTU8InlMNQI/w-d-xo.html
But thanks anyway. Now i knew that the low pressure switch isn't require.