Aqueon Foam Cleaning Pads are a great option to scrub unwanted algae from any aquarium. The pads work on both glass and acrylic aquariums to remove the algae from the aquarium walls. The special micropore structure improves cleaning ability over standard polyester pads and sponges. For use with Aqueon ProScraper 3.0 Short and Adjustable Aquarium Algae Scrapers with the use of the Twist & Click Head attachment that is sold separately. To add or remove Foam Cleaning Pad from scraper head, attach pad using the blue polyester side and sticking one end to the black Velcro on one side of the head. Bend the pad to curve around the top of the head and attach the other end of pad to black Velcro on opposite side. It can also be used without a scraper. Use the blue polyester pad for hard scrubbing and micropore foam side for soft scrubbing. Easy algae removal from acrylic or glass aquariums. Special micropore structure improves cleaning ability over standard polyester pads and sponges. May also be used without scraper. Use blue polyester pad for hard scrubbing and white micropore foam side for soft scrubbing. After use, squeeze out any remaining water in pad before storing. 2 Pack. To Add/Remove Foam Pad: Attach pad using the blue polyester side and sticking one end to the black Velcro on one side of the head. Bend the pad to curve around the top of the head and attach the other end of pad to black Velcro on opposite side.