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Aquasky ® ROT-4 Tank is the tank number for a standard tank used on many, many reverse osmosis systems. Most are systems using standard size replacement filters and reverse osmosis membranes. For help matching up your system see:
Standard Reverse Osmosis systems using standard size replacement filters and RO membranes.
While the tanks in the help file may look different from the Aquasky ROT-4, look to match the described configuration of the filters. The systems shown are using other generic tanks in place of the Aquasky ROT-4.