| No testing needs to be done..... the vertical unit contains much more water, as the housing contains a filter cartridge, which holds the resin. At least 1/2 of the capacity of the filter housing is water only. The filter cartridge holds the same amount of resin that the horizontal holds........
__________________
WWW.INREEF.COM
20 years saltwater, over 700 gallons of reef at the house!!
|