YES! We do build custom reactors. Take a look at a recent project for the EXPO '98 Aquarium exhibit in Lisbon Portugal. This unit is to be installed on a 5,000 gal. display tank. It utilizes a sand filter for the reactor vessel and it takes a 1 HP RK2 pump to drive it.

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Call us with your special sizing requirements.   We'll be happy to quote the project for you!