A Pre-Filter Cartridge is the first line of defense in an RO system, capturing larger particles like dust, rust, and sand before they reach the main filters. I recently installed one for just ₹250, and it noticeably extended the life of my RO membrane and improved water clarity. Pros include protection for internal filters, longer purifier lifespan, and reduced maintenance costs. Cons include the need for frequent cleaning or replacement, especially in areas with dirty or hard water. For households using borewell or municipal water, a pre-filter is a must. It’s a small, affordable part that makes a big difference.

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