rainwater through my ro unit

[richy's reef]

HI

My rainwater tank is running less tds than my main water supply to my house. ( 60 instead of 80 )
My question is this, my rainwater tank is pumped and is used to flush toilets and feed the washing machine in the laundry and is coming out at good pressure, can i hook up my ro/di unit to the washing machine feed in the laundry ( so rainwater under pressure ) to make my own saltwater at home. ?

i have a 4 stage 150g unit brand new, cant see why i cant myself but putting it out there to more wiser people than me with more experience.

thanks in advance

[Combatants]

As long as the pressure is close to your mains pressure, it should be fine

[roboreefer]

I've heard that one concern is the risk of a biofilm growing and cloging your membrane prematurely. Apparently adding a UV steriliser before the filter can reduce the impact.