Used a couple of months, then upgraded to a much bigger one. Supposed to be good up to 75 gallons, but if you plan on spa dominate I would say 55 gallon max. This is only the reactor. Every thing else was transferred over to my new one. You will need media, co2, and co2 regulator. It is a very well built, and easy to use reactor, I just don’t need it. $115 obo. Crispy boy for size purposes.