RO Unit storage tank upgrade?

[digi]

Hey all,

I've bought myself a kenmore RO filter system about a year ago, and was using it for my 9 gallon nano system. It works great, but I've now sold off the nano tank and am thinking of going much bigger... probably around the 90 gallon area.

I'm wondering if the storage tank from my RO unit can be upgraded? Its only got a 4 gallon tank right now, which could be difficult to work with for a 90 gallon tank.

A link to the product I've got is here: http://www.sears.com/shc/s/p_10153_1...2&blockType=G2

Any ideas anyone?? Has anyone done this?