Staypoollizer Premium with Nxgen Flow Control (White) The Staypoollizer Premium Automatic Water Leveler (White) , a robust, stable and maintenance free way to maintain a constant water level year round that is fully compatible with fresh and salt water chlorinated In Ground and Above Ground swimming pools. Nxgen Flow Control patent pending enhancement allows the Staypoollizer to control your pool water level with 158% more efficiency (NO WATER REGULATOR REQUIRED). This allows water pressures to exceed 155 psi and continue to work properly. Nxgen advantage - Solid metal inlet  High Performance - ZERO water pressure on the tank assembly, eliminates stress cracks, leaking threads, flatten and worn water inlet issues. Nxgen increases product life and dramatically improves performance. Nxgen Flow Control is unaffected by pool chemicals, ultimately providing the best engineered longest lasting pool water replenishing device on the market. No assembly required. Fresh or Salt water pool use. Robust U.V. stabilized body with limited life time warranty on the adjustmant frame and 1 year on the float assembly. The adaptive design of the Universal Staypoollizer allows it to sit over the edge of any style pool deck and remain in place while automatically and continuously maintaining your pools water level within a 1/4 inch year round. 4" to 9" adjustable water range with addition ranges available upon request. Vinyl Liner Safe. Smooth surface design. No protruding wing nuts or hardware. No need for additional costly add on hardware for level adjustment. 5 lbs 4 ounces -the heavy weigh of the auto fill market