Gravel is typically used for recirculating filters which can accept larger amounts of wastewater than single-pass sand filters. Nationwide, more sand filters have been used to treat water and wastewater than probably any other advanced pretreatment technology. Regionally, other solid granular media such as crushed glass and bottom ash have been used.
Feb 20, 2005· In the U/G filter, the "noodles" are the gravel, and just as each noodle is coated with bacteria, so is each particle of gravel, along with just about …
The under gravel filter uses the gravel as filtration media, thus providing mechanical and biological filtration since the beneficial bacteria usually makes colonies on objects, instead of just floating around in the water like the malicious types; the gravel is perfect for vast colonies of beneficial bacteria.
The gravel provides the surface area for nitrifying bacteria to colonize. The bacteria reduce fish and plant waste into plant food. Growing in the gravel are bog plants that take up the plant food. The water is returned to the pond stripped of all nutrients thereby “starving” the algae which cannot grow.
Gravel filtration ushered in a new wave of popularity in aquarium keeping many decades ago and made keeping the home aquarium much easier and prettier. If you are using gravel in your pond you must treat it and consider it as a form of filtration because whether you intend it or not, it is going to function as a filter.
Jun 28, 2015· I have always been intrigued by the idea of turning waste into a resource, and that is exactly what a bog gravel filter does for you. It turns fish and plant waste into fertilizer (plant food). This plant food is then consumed by the plants growing in the filter. The happy byproducts of this process are clear water and low maintenance.