Which filters for RODIN

[mgrmax]

Hey,

I just purchased a used typhoon RODI unit off a local reefer. I want to get the filters from BRS. The filter packs they sell have 3 filters and DI resin yet there are 5 filter holders on my unit.

What am I missing? Is there a separate filter I have to get other than the set of filters?

Thanks!

[TimeConsumer]

Are you including the membrane in your count of filter housings? If so, it's not including in most filter packs as it doesn't need to be replaced as often. Although being you have a used unit you might want to look into replacing the membrane just in case.