Conventional AC power is produced by rotating machines (alternators) that produce a smooth alternation, like that of a pendulum. It is described mathematically as a "sine wave". It is the ideal waveform for the transfer of AC power.When converting AC to DC power most DC controllers will convert the AC power to a DC Square wave or DC modified square wave. For the most part a DC Modified square wave will often emulate a True Sine wave reasonably well but the driven pump will often operate with audible levels of noise and a slightly ‘choppy’ operation due to the stepped square waveform compared to a smooth True Sine Wave.Utilising True Sine Wave Technology the new SOW Sine wave pumps result in a quiet and smooth operation that extends the lifespan of the wavemaker. Features 8 Different Flow Rates 4 wave modes Very Quiet Operation due to Sine Wave Technology Wireless Controller - if 2 SOW pumps are used, controllers can "sync" wirelessly, to enable the SW pumps to run "in sync" or "anti - sync". Easy installation and maintenance. Magnetic bracket that allows a higher degree of pump rotation compared to SW pumps. Night sensor - automatically detects when tank lights go out and slows the pump. One-touch feed mode - slows pump for a period of 10 minutes. High performance, powerful, water flow combined with low energy consumption. Ceramic shaft for long life and durability Intelligent control system to generate various wave patterns to suit your tank. Extra-long cable for ease and comfort of placement, even on larger tanks. Low voltage, safe, reliable UK power supply. Suitable for aquariums with glass up to 15mm thickness. (20mm for SOW 20) SOW-20: Flow rate adjustable from 700 - 20,000 litres/hour - 50W
