ATI Hydro Sponge Filter #4 Bulk with New Gravel Base hikari wheat gen sinking medium Filter sets include one coarse

Filter sets include one coarse pre-filter pad that removes large particulate matter

Samples taken at six inches in depth have been proven to give a more accurate salinity reading than surface samples

A consistent pH reading is more ideal than frequent changes up or down

An excellent toy for mental simulation and developing problem solving skills

2 sides of stainless steel mesh

ATI Hydro Sponge Filter #4 Bulk with New Gravel Base hikari wheat gen sinking medium Filter sets include one coarseThe ATI sponge filters are excellent biological as well mechanical filters that only need a source of air to operate. They are excellent for fry tanks because they won't suck up your babies! For aquariums up to 80 gallons. Sponge size 4 x 4. 75 Inches Comes with 5 inch lift tube. Bulk sponge filters are the same as the ones in the box without the packaging! New gravel base eliminates the step on the original sponge filters due to the height. Hydro