For use in medium-sized to large aquariums, ADA Pollen Glass Large Series is available in 20mm. and 30mm. to suit your aquarium’s CO2 needs. Pollen Glass LARGE Series are also recommended for aquariums using many aquatic plants like Riccia fluitans, which require a large CO2 supply for their growth. Its U-shaped glass tube is unobtrusive and eliminates the clogging of gas. Handmade, all-glass distributors, designed for long-term use.

20MM specifications: Suitable for 60cm aquarium (20 Gallon)
30MM specifications: Suitable for 90cm aquarium (50 Gallon)