Why is there always some water left in the tank that doesn’t get filtered?

This 'rejected water' is essential to RO systems—it carries away concentrated impurities (salts, heavy metals, etc.) blocked by the filter membrane

What’s the difference between Y9A and Y9T?

Y9A adds minerals to create smooth-tasting alkaline water ideal for daily drinking.

Why does the purified water still have TDS (Total Dissolved Solids)? Shouldn’t it be zero?

Non-zero TDS ≠ malfunction：Y9T reduces TDS to near-zero via unique filtration technology; Y9A will boosts TDS (10-30ppm) by remineralization for alkaline water, while and mineral content. (Final TDS depends on feed water quality)

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SimPure Y9 Series T33 Filter Replacement Cartridge for Y9T and Y9A Countertop Reverse Osmosis System, 6 Months Replacement Cartridge (1 Pack)

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