Same thing happened to me. Newby(me) advised on 300gpd system, then when it comes it doesn't work.Post search on here say buy booster. Supplier you don't need one- lot of technical stuff about temp pressure rotation of earth etc. Bafflement, waste time. Eventually supplier says you can try a booster, but...-more technical stuff.
Booster comes works perfectly gushs out at between zero and one. Ring supplier who says told you that would do it, glad we were able to help.
I think it's some kind of iniation rite. Expect to spend £300
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