Netafim Arkal Short Manual Disc FilterNetafim disc filters offer 3 times better filtration efficiency for your irrigation system. Durable, long lasting and with an efficient backflush process, our disc filters enable better irrigation uniformity Disc Filter technology has grooves in the disc rings that crisscross to form a network that traps debris between and on the outside of the discs. As dirty water is pumped into the filter and pressure increases, the water compresses the disc rings