Our
perforated ABS solvent weld (1.5") inserts when used with
sponge blocks make an excellent final polishing stage. When larger
flow rates are required they can be used in a manifold configuration
(as below) using 1.5" solvent weld fittings. Sold separately.
Shown
below is an alternative configuration for an under gravel filter
Shown
below fitted with foam blocks
Four
sizes of foam blocks are available
All
blocks are 4" x 4" square with lengths of 6", 8",
10" & 12"
Sponge inserts
as used in our Rotofolds and Big Bertha Systems
