Aqua Exclusive Green Line BIO 25 Manuel du propriétaire - Page 11

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Installation

7. Gravity setup

A gravity fed filter works in the opposite way to a pump fed filter system, with the pump

drawing water away from the filter either via a suction hose, or been situated in the filter's

final chamber. Because gravity will always keep the water levels equal, when the pump pulls

water from the filter, pond water is replaced in the filter via the bottom drain. Gravity fed

systems are generally more efficient when compared to pump fed systems; bottom drains

require very little maintenance and are able to remove all pond waste, whereas pump cag-

es can become blocked over time.The pump in this system is pumping clean, filtered water

and therefore does not need as much maintenance. It also doesn't usually need to pump the

water to as much of a head in comparison to many pump fed filter systems, so the flow-rate

isn't reduced as much.There are no cables or hoses coming from the pond which can look

unsightly and may trap debris in the pond. Water entering the filter isn't as turbulent as in a

pump fed system.

7.1 Advantage gravity setup

The big advantage of a gravity setup compared to a pump fed setup is that you need less

power to run the same amount of water through the filter. The disadvantage is that it takes

more time to install everything.

7.2 Example gravity setup

Figure 5: Gravity setup overview

Installation