Old RO/DI

[outtafocus]

Im a little confused, what filters do I need for to purchase for use in my Aquasafe system?

The DI resin is pretty easy to figure out, but Im not sure on the filters.

I have seen filters similar to the ones in my RO/DI unit at places like Home Depot and Rona, are these filter ok to use or do I need to buy specialty filters?

How long is an RO membrane good for?

Thanks