A lot of folks here to their RODI
unit on eBay. I got a Typhoon III several years ago from AirwaterIce
. They reccomend a 10 micron sediment cartridge followed by a 5 micron charcoal, then a 1 micron charcoal. This leads to the RO
membrane which is then followed by the DI
carridge. I now use the DI Refillable kit
. I can always get a new sediment cartridge at Lowes or HD if I run out, but the cost from AWI is less.
When I replace my membrane I will get the new 150gpd that they have which also has a 98% rejection rate. The 100gpd only has a 90% rejection rate and is not recommended for reef (leaves too much for the DI
I also prefer the clear cartridges so I can see how dirty the sediment filter is getting.