Top rate high quality alternative foam clear out blocks made for the AquaClear 110 / 500 Filtration Techniques; sometimes called phase quantity A-623.
Plays mechanical filtration through trapping particles and particles as they move during the insert
Customized have compatibility to stop bypass
Complements organic filtration
Just right for freshwater & saltwater environments
Supplies environment friendly water float with much less clogging for lengthy lasting filtration