AquaFX 500 GPD 7-Stage RO/DI Blue Fin PRO Light Commercial System - AquaFX $799.99 NEW! AquaFX Blue Fin PRO Light-Commercial 500GPD 7-Stage RO/DI System perfect for small/medium size coral farmers and aquarium stores that do not sell water, or hobbyists with large aquariums! Highlights 500GPD Light-Commercial... Add to Cart