1.competitive price and high quality 2.warranty one year 3.technical support 4.ISO9001 5.install compact Detailed specification 1. Automatic backwash and manual backwash 2. Automatic switch on when low water level, and switch off when high water level 3. Water shortage protection for multi-stage pump4. Protection when no voltage, under-voltage, over-current, short circuit and creepage5. Full ...