RO/DI filter change help

[mk4fan]

So i got this ro/di unit from someone who bought it off ebay and need to replace the filters for the 3 stages. The unit is about a year old so the ro membrane should still be good. Need help deciding what filters to get.

a- one 5 micron sediment, two 5 micron carbon

b- two 5 micron sediment, one 5 micron carbon

c- one 5 micron sediment, one 1 micron sediment, one 5 micron carbon

etc.....

Thanks for your help!

 

[Dre]

5 micron or 1 micron sediment,5 micron or 0.5 micron carbon,DI.Cartridge.

 

[mk4fan]

5 micron or 1 micron sediment,5 micron or 0.5 micron carbon,DI.Cartridge.

Thanks, just found this on Ebay seems like a good deal.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230307438018&ru=http%3A%2F%2Fshop.ebay.com%3A80%2F%3F_from%3DR40%26_trksid%3Dp4712.m38.l1313%26_nkw%3D230307438018%26_sacat%3DSee-All-Categories%26_fvi%3D1&_rdc=1