The Sulphur Nitratereductor SN 400 is used for saltwater aquaria up to 100 gal., and is very similar to the design of the Nitratereductor NR 400. An internal pump circulates the water through chambers containing sulphur beads and hydrocarbonate. As a by-product, sulfuric acid is produced which is neutralized by the hydrocarbonate in the filter.
Dimensions: without electrode (l x w x h): app. 5.8 x 4 x 14.5 in.