C1: 1*pressure gauge, backwash without water system, manual blowdown C2: 2*pressure gauge, with water backwashing, automatic drainage describe: -Time memory function, scrubbing device automatically rotates -The top of the pre-filter can be rotated, numbers 1-12 record the month of the last flushing and draining, which is convenient for regular flushing -Whole house water purification without changing the core for life -Effectively intercept red worms, silt, floating debris and other particulate impurities, extending the service life of water purifiers and wading appliances -The amount of filtered water in 1 minute is equivalent to 4 buckets of 17L bottled water Specification: Product name: Pre-filter Installation method: prefabricated Working principle: stainless steel filter Water outlet method: double outlet Principle: Microfiltration Place of use: Central Water Purification Filter element: stainless steel filter element Purified water flow 4T/H hint: Normal water quality is generally cleaned every 2 months. After washing, be sure to close the drain valve in place to prevent water leakage