Acid Neutralizing Media.
Brand name = Corosex ( Magnesium Oxide ), OR "FLOMAG
" = 50 lbs. Box, 2/3 ( 0.66 ) cubic foot.
Corosex / FloMag (Magnesium Oxide), is normally mixed with Calcite to treat very low acidic water ( less than 6.0 pH ). A 50/50 mix of Calcite and Corosex is often used. Corosex media should be backwashed on a regular basis to prevent it hardening. You will need to add more every 6 - 18 months ( depends how low your pH is to start and how much water you use ).
Note the high UPS ground shipping charge has been figured into the cost, as we only charge a flat Standard S & H fee on our orders in lower 48 States of USA.9" x 48" tanks = 1.0 cu.ft. plus gravel
10" x 54" tanks = 1.5 cu.ft. plus gravel.