The dual parallel lateral design and the water recovery channels, both developed by Leopold, give even distribution with less than +/-5% maldistribution and no dead zones.
The Type S underdrain can be specified with Leopold I.M.S.® 1000 or 200 media retainers and factory-installed on the Type S underdrain to save time at installation. The I.M.S. media retainers replace up to 14 inches (36 cm) of gravel media support allowing for the same media depth in less vertical space or longer air/water backwash.

Technical details

Uniform distribution of air and water even in extra-long lengths ;
Standard profile of 12” (30cm);
Can be designed for wall-feed applications as well as center flume, front flume and Leopold; Flat Bottom flume;
Superior air and water distribution for effective backwash giving longer filter runs and lower operating costs;
Easy handling – snaps together for quick installation;