i got my self a 300GPD RO and made it up to a 400GPD and i just read that a Flow Restrictor 3-1without booster pump and a 5-1 with booster pump but that was for a 300GPD what i want to know is i will be getting a booster pump soon will the 1 on the RO at the mo be ok with 400GPD and what 1 will i need when i get a booster pump i hope you can understand what i mean.