Oase Raised Pressurised Filter Systems

Oase Pressurised Filter Systems: Pond volumes with raised filter outlet

Pond Turnover Rates: The pond stocking levels will determine the required turnover rate which in turn determines the required pump flow rate. Typically, an ornamental pond without any fish will require the pond volume to be circulated at least once every 6 hours; an average stocked pond (with up to 1 kg of fish for every 1000 litres) will require circulating once every 4 hours; a heavily stocked pond including Koi (with up to 3 kg of fish for every 1000 litres) will require circulating once every 2 hours.




Effect of raising the filter outlet: Raising a gravity outlet, typically for a watercourse or waterfall, will reduce the flow rate from the pump thereby increasing the amount of time it takes to circulate the dirty pond water through the filter. This effectively reduces the maximum pond volume that the filter system can cope with and the resultant reduction in pond volumes are stated in the charts below.



Pump Flow Rate: The pump flow rate (typically in litres per hour lph or litres per minute lpm) is determined by the vertical lift, in metres, from the surface of the pond to the outlet pipe AND by the friction losses through the system. The narrower the pipe bore the higher the friction losses, so always use the maximum hose diameter. There will also be a friction loss caused across the filter media (foams etc).



The importance of regular maintenance (cleaning): High flow rate = effective filtering. As the filter media (e.g. foams) remove dirt and waste from the pond, so the friction loss across the foams will increase, thereby reducing the flow rate and the effective performance of the filter. It is therefore essential, especially for those systems with a raised outlet, to keep the filter foams clean. Fortunately, this is extremely easy with Oase pond filters.

Guide to adjusted recommended pond volume when raising a filtoclear filter discharge outlet
Filter Set	Part Number	Filter Model	Ultraviolet Clarifier	Pump Model	Height of filter outlet above the pond water surface	Recommended Pond volume in litres
Filter Set	Part Number	Filter Model	Ultraviolet Clarifier	Pump Model	Height of filter outlet above the pond water surface	No Fish	Average Fish Stock 1kg/1000 litres	Koi/High Fish Stock 3kg/1000 litre
Filtoclear SET 3000A	56396	Filtoclear 3000	9 watts	Aquamax Eco 2000	50 cm	1500	750	N/A
Filtoclear SET 3000	56968	Filtoclear 3000	9 watts	Aquamax Eco 4000	50 cm	3000	1500	N/A
Filtoclear SET 6000	56969	Filtoclear 6000	9 watts	Aquamax Eco 6000	50 cm	5500	2500	1250
Filtoclear SET 6000	56969	Filtoclear 6000	9 watts	Aquamax Eco 6000	1 metre	2000	1000	N/A
Filtoclear SET 11000	56970	Filtoclear 11000	11 watts	Aquamax Eco 8000	50 cm	9000	4000	2000
Filtoclear SET 11000	56970	Filtoclear 11000	11 watts	Aquamax Eco 8000	1 metre	3000	1500	N/A
Filtoclear SET 15000	56828	Filtoclear 15000	11 watts	Aquamax Eco 12000	50 cm	13000	7000	3500
Filtoclear SET 15000	56828	Filtoclear 15000	11 watts	Aquamax Eco 12000	1 metre	6000	3000	1500
Filtoclear SET 15000	56828	Filtoclear 15000	11 watts	Aquamax Eco 12000	1.5 metre	2000	1000	N/A
Filtoclear SET 15000A	56828A	Filtoclear 15000	11 watts	Aquamax Eco 16000	50 cm	16000	8000	4000
Filtoclear SET 15000A	56828A	Filtoclear 15000	11 watts	Aquamax Eco 16000	1 metre	8000	4000	2000
Filtoclear SET 15000A	56828A	Filtoclear 15000	11 watts	Aquamax Eco 16000	1.5 metre	4000	2000	1000
Velda Clear Control 75	126371	Velda Clear Control 75	36 watts	Aquamax Eco 12000	50 cm	30000	15000	7500
Velda Clear Control 75	126371	Velda Clear Control 75	36 watts	Aquamax Eco 12000	1 metre	24000	12000	6000
Velda Clear Control 75	126371	Velda Clear Control 75	36 watts	Aquamax Eco 12000	1.5 metre	18000	9000	4500