Ro/di flush valve (do I need one)?

[corbett_n]

I am about to buy a ro/di and was wondering if I needed one with a flush kit. It seems like I have read threads that talk about not using them, but I can't really remember. Can anybody help me?

 

[corbett_n]

also what would be the advantage to getting a 50gpd RO/DI unit instead of a 75gpd unit for the same price.

 

[faze07hd]

1. flush kit would help the membrane last the couple of years that it should, by not flushing it, it might not last as long.

2. no advantages, more like a disadvantage, it would take a longer time to fill up the jug with r/o water.

 

[corbett_n]

how often do you flush it?

 

[herozero]

some say once a week, some say after every use. i've waited two weeks once and saw all this black stuff when i flushed my spectrapure. now i do it for 30 seconds after every use.

the RO membrane is the most expensive part, if you can prolong its life with a $10 piece of plastic and tubing, do it.

rumor is units with GPD over 75 have lower contact time with the membrane hence more TDS, but i have no personal experience with it.

 

[corbett_n]

thanks for the advice