... adjusting device. Equipment when movement, the water supremelypasses the filter bed from under. This time, active orifice adjustingdevice upward ... and the hole graduallyreduced, realizes the in-depth to filter. When the filter bed ispolluted must clean the regeneration, the clear ... , needs specially to clean, after might use 2% NaOH solution tofilter the material to soak for 24 hours, then will ...