Features:

• Unit includes a 9 watt ultraviolet clarifier (UVC). 
• Multi-stage biological and mechanical filtration with powerful 9W UV clarification to give you a clear and healthy pond.
• Easy view indicators show when the UV light is working and when it is time to clean the filter.
• The clear hose tail on the exit of the filter allows you to easily and safely monitor that the UV lamp is operating.
• Inlet/Outlet: 20mm/25mm/32mm/40mm.
• Max. Flow-through: 10000 litres per hour (lph).
• Filter volume: 20 litres
• Large foam surface provides increased filtration with bio-balls giving beneficial bacteria to your pond health.

HOW DOES IT WORK?
STAGE 1 - MECHANICAL FILTRATION:

Water is pumped into the filter creating the necessary pressure to begin the mechanical filtration stage. Two foam discs collect various sizes of unwanted organic debris encouraging the growth of large numbers of beneficial bacteria which break down harmful pollutants.

STAGE 2 - BIOLOGICAL FILTRATION:

At this stage the water passes through the bio-balls at the bottom of the filter. These have a large surface area & provide a habitat for beneficial bacteria to grow which naturally convert the harmful toxins of ammonia & nitrites into useful nitrates to support a healthy pond environment.

STAGE 3 - UV CLARIFICATION:

The water which may contain microscopic suspended algae spores passes the UV lamp clumping and killing the spores to give crystal clear water.

WHY This External Pond UV Bio-Filter SO EFFECTIVE?

• Water is slowed down as it passes the lamp to increase UV penetration
• Quartz glass tube covering the UV lamp permits effective penetration of UV rays.
• Ordinary glass cuts this by 90%
• UV lamp runs at optimum operating temperature in an enclosed chamber
• Water is kept as close as possible to the UV lamp to maximize UV efficiency
• Single ended lamps last longer and have higher UV output