Check the listing for details. GLB Filter Cleanse 2lb. Condition: New. Listed at 33.50 USD. A combination of acids and detergents in this multi-purpose granular formulation cleans and unclogs grease, oils and scale from all types of swimming pool filters. Its unique chemistry will gradually change from red to yellow as it cleans, so you know it’s working. – Use routinely once every month or two during the season to maintain efficient operation. – Must be pre-dissolved prior to using this product. Follow the easy instructions on the package. – Compatible with chlorine, bromine, salt water chlorine, ozone and biguanide sanitizing systems. SHIPPING: We will do our best to ship your order based on the shipping method selected, however in some cases, your shipping method may need to be modified to meet shipping requirements based on the carrier. Our current carriers used are UPS, FedEx and USPS. Please contact us directly through the "Contact Seller" link if you need UPS, FedEx or USPS specifically for your order.