Al, I personally like the combination systerms of RO/DI's. For more information on those you can visit my site www.threeguysaquatics.com and under the RO's the 2-3 stage are just RO's. The 4+stages involve a DI canister. You can look at pictures on the site to show ya. You can email me questions on them if you'd like. Mike Chappell ----info@threeguysaquatics.com---- -----Original Message----- From: owner-apisto@admin.listbox.com [mailto:owner-apisto@admin.listbox.com]On Behalf Of AL SMITH Sent: Sunday, March 18, 2001 7:39 PM To: apisto@listbox.com Subject: R/O or DI... I was wondering which would be better..R/O unit or DI unit..I was looking at the AquaTech Kati #2 unit for a Di unit or a Kent Maxxima HI S 60 system...My question is which will do a better job of softning water..My well water is 110 micro siemens and ph of 7.0...its a shallow well fed by springs..water conservation is also a factor...I have used a tap water purifier by aquarium pharm. and the end water is 3 micro siemens..the aquaTech is regenerable also... Al ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://www.digital.com for "Apistogramma Mailing List Archives"! ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://www.digital.com for "Apistogramma Mailing List Archives"!