Specifically, the new Biotec filters have an individual chamber, which is filled as standard with Zeolite, However, as the name indicates, the use of other filter media such as Oase Phosless is possible.

The Biotec filters are "activated" with the aid of the Teichkur set, consisting of strains of bacteria, special granules and a bio-stabilizer.
 
This results in the colonization of friendly bacteria which get rid of harmful substances by converting ammonia into nitrite, nitrite into nitrate and nitrate into nitrogen, which then volatilizes and is therefore removed from the pond. 

OASE Biotec filters are considered the best filters in the water gardening industry. Their gravity flow design provide unsurpassed mechanical & biological filtration. Use the table below for product specifications.

Products Specifications	Biotech 18	Biotech 36
Dimensions (L x W x H)	31" x 23.5" x 21"	47.5" x 31.5" x 30"
Max Flow Through	6000 GPH	10,000 GPH
Inlet Hose Adapter	¾" - 1½"	1" - 1½"
Outlet	2.76"	3.94"
Blue Filter Pads	8	18
Red Filter Pads	8	18
Special Granulates	13 lbs	40 lbs
Suitable for ponds with  heavy fish load	11,000 gallons	21,000 gallons
Suitable for ponds with  normal fish load	21,000 gallons	42,000 gallons
Warranty	3 years

With Biotec 30 and its integrated drain, the facility to remove filtered particles and the biological decomposition of superfluous nutrients OASE has once again achieved a superior technological lead in the market.

• This filter is suitable for a maximum flow through of 30000 litres per hour.
• Suitable for garden ponds up to 134000 Litres.
• Developed for large ponds with Koi fish.
• 3 years functional guarantee!