Aquarium sponge filters come in four different sizes. You can visit the specific product page of the(link removed) to see their exact dimensions, but generally: Nano = 5 gallons and up Small = 10 gallons and up Medium = 20 gallons and up Large = 40 gallons and up Moreover,
for cleaning sponge filter Clean the sponge filter in used aquarium water. put some aquarium water in a bucket and squeeze the sponge a few times in this water Don't keep squeezing until every bit of dirt is gone, many bacteria live in that dirt. If you have 2 sponges in the filter, try doing one sponge a week. If the sponges stay real dirty with this method, you should use a prefilter sponge. (a sponge on the intake for the filter, if hang on back filter) Prefilter sponges can be cleaned "daily" to help keep the filter cleaner. If water is cloudy, check for ammonia and nitrite, it could be a bacteria bloom.Usually increase wc's 30 to 50% day. Make sure stable ph in wc water and no chlorine