Protector filter series available from Waterflow Control Waterflow Control The Protector filter series is available from Waterflow Control . The advantages: BWT-Protector: that is high performance, good materials and workmanship, modern design and easy operation. The Protector filter series offer the right protection for any purpose and application – be it in single-story systems, at the inlet of hot water pipes or right at the water main. The Protector filter series includes backwash filters, easy-change filters and hot water filters with various filtration rates. Protector backwash filters always ensure a perfectly clean filter element by controlled backwashing. No matter which type of BWT-Protector you choose – it is always a decision for reliable protection against rust and sediment ingression into your piping Protector filters – advanced filter technology, made in Germany.