Precision Filter | Depth Filter Unit | Precision Separation Technology

Working Principle Liquid comes in through the inlet and moves through the cartridges or depth media inside. As a depth filtration unit, it doesn't just catch particles on the surface—the liquid actually flows into the media, where fine suspended solids, colloids, and impurities get trapped and held in the pores. Over time, the cartridges start to clog, the pressure drop between inlet and outlet climbs, and once it reaches the set point, it's time to replace or clean them. With precision separation technology, the unit keeps putting out clean, consistent water at high accuracy. It's commonly used as a final safeguard ahead of RO systems, ultrapure water, pharmaceutical water, food and beverage processing, and fine chemical filtration. Application Fields 1.Pharmaceutical industry: final filtration of liquid medicines, water for injection, and purified water to remove particles and microorganisms. 2.Electronics industry: ultrapure water production and cleaning solution filtration to control fine particles and metal impurities. 3.Food and beverage: clarification filtration of liquor, beverages, and drinking water to ensure taste and hygiene standards. 4.Fine chemicals: purification and impurity removal of solvents, resins, coatings, inks, and other liquid materials. FAQ Q1: What parts make up a precision filter? A: Mainly two parts — the housing and the cartridges. The housing is usually stainless steel, either 304 or 316L, and it can come with a quick-open design for easy cartridge changes and cleaning. Inside are tubular cartridges, commonly PP melt-blown, wire-wound, pleated, titanium, or activated carbon. A cartridge is made up of a core, the filter media, and end-cap seals — the seals keep water from bypassing the media. On the outside, you've got inlet and outlet ports, a vent valve, a drain valve, and a pressure gauge for monitoring pressure drop and draining out waste. Q2: Why is a precision filter usually placed ahead of RO? A: RO membranes are picky about feed water. If fine particles, colloids, or leftover impurities are still in the water, they can clog the membrane, and cleaning or replacing it gets expensive. The precision filter sits upstream as a gatekeeper, catching those impurities first and protecting the RO membrane behind it. With precision separation technology, it's accurate enough and delivers steady effluent, making it a key final safeguard in an RO system. Q3: When should the cartridges in a precision filter be replaced? A: It usually comes down to the pressure drop between inlet and outlet. After running for a while, the cartridges trap more and more contaminants, and the pressure drop slowly climbs. Once it reaches 0.05–0.1 MPa, or the set replacement cycle comes up, it's time to change them. Even if the pressure drop stays flat, you should still replace on schedule — otherwise the cartridges sit in water too long and bacteria can grow. Picking the right material and rating when you swap them is what keeps the effluent on spec.