Waterdrop WD-TSA Under Sink Water Filter, 8-Stage Filtration, 1.5 GPM

At 12.9 × 4.3 × 12.4 inches, the Waterdrop WD-TSA is designed to fit beneath a sink and connect directly to a faucet. Its compact format keeps filtered water available at the kitchen sink without adding a countertop unit.

Three filters work together to provide eight-stage filtration, targeting substances including PFAS, PFOA/PFOS, fluoride, chlorine, sediment, and rust. The CT filter is certified to NSF/ANSI 42 and 372, and IAPMO-certified to reduce residual chlorine and improve taste.

For everyday drinking and cooking, the system offers a direct connection and a maximum flow rate of 1.5 GPM. It retains beneficial minerals and does not reduce TDS, making it a different approach from filtration systems intended to lower dissolved solids.

Key specifications

• Type: Under-sink water filtration system
• Filtration: Three filters with eight-stage filtration, activated carbon method
• Reductions: PFAS, PFOA/PFOS, fluoride, chlorine, sediment, rust, cysts, and taste and odor
• Maximum flow rate: 1.5 GPM
• Dimensions: 12.9 × 4.3 × 12.4 inches
• Filter replacement cycles: PP, 6 months, GC, 8–12 months, CT, 12–18 months
• Faucet connection: Direct connection for compatible 3/8-inch or 1/2-inch female NPT threads

Compatibility & requirements

The WD-TSA is designed for standard under-sink cold-water connections and municipal tap water. It is not intended for hot water, for well water, use a pre-filtration system. The system does not reduce TDS, so naturally present beneficial minerals remain. A compatible faucet connection is essential: the listed direct-connect fittings are for 3/8-inch or 1/2-inch female NPT threads. A quick-connect faucet may require an adapter fitting. The faucet itself is not included.

This setup is practical for a kitchen where filtered water is used throughout the day for drinking, filling a glass, or preparing food. Instead of placing a separate filter on the counter, the unit sits under the sink and supplies water through the connected faucet. Its focus is reducing specified contaminants while retaining minerals, rather than reducing TDS.

Tips for day-to-day use

Keep track of the separate replacement schedules: the PP filter is listed for 6 months, the GC for 8–12 months, and the CT for 12–18 months. Replacing each filter according to its cycle helps maintain the system as intended. The manufacturer recommends storing filters in sealed plastic bags in the refrigerator—not the freezer—before a vacation, for up to 30 days.

Customer feedback often highlights straightforward under-sink installation and improved water taste. Reports about filtration results and flow vary, so individual experiences are not uniform. The stated maximum flow rate is 1.5 GPM, and the multi-stage filtration is designed to provide contact time for reducing the listed substances.

Is it worth it?

The WD-TSA is a considered choice for households looking for an under-sink system that connects directly to a compatible faucet and targets chlorine, fluoride, PFAS, and other listed contaminants. Its three-filter design combines several filtration stages, while mineral retention and no TDS reduction define its approach. It suits you if you want filtered water at the kitchen sink without switching to a system focused on lowering TDS.