Unifilt is the only full-service filter material company, with experienced staff and equipment to efficiently remove and replace media. Equipment rentals and technicians are available for underdrain repairs or replacements. We specialize in the supply of anthracite, sand, gravel, and garnet which exceeds AWWA B100-09; NSF standard 61. Filter evaluation and testing to confirm performance and compliance. Uni Liners for rehabilitation of Wheeler bottoms, constructed of durable HDPE, mechanically lock into place requiring no adhesive. Uni liners rehabilitate wheeler bottoms to a perfect form without tedious, costly hand work. Replace worn out liners for a fraction of the cost.