The PZ7 provides a universal ozone system for pools up to 40000 gals (152000 liters). Housed in an anodized aluminum case, the system features two hybrid arc tubes to generate ozone, a universal power supply (operates on 120 and 240 VAC), and a universal bypass installation kit (good for 1-1/2 Inch and 2 Inch returns). Prozone has combined the PZ7 product line to one universal model. This patented system has two corona hybrid arc tubes which provide a combination of very ultraviolet and corona discharge ozone generation technologies for pools up to 144 m3 (40000 gal).Prozones patented Corona Hybrid Ozone systems provide higher concentration ozone generation without the corrosive and toxic by-products of traditional corona discharge machines. The result is a new technology that produces a reliable, high output and takes advantage of the inherent simplicity, ruggedness and pure ozone production of the very ultraviolet system