What is the Flow and Backwash for Various Filter Media?
A backwashing filter is a type of water filter that cleans itself by rinsing away the contaminants it has filtered from the water on a regular basis.
A backwashing filter may resemble a water softener in appearance and size, but it is a wholly distinct species.
It is a straightforward device that consists of a large tank known as a "mineral tank" that is filled with a filtering substances known as a filter medium. Water enters the tank through a particular control valve at the top and flows downhill into the medium, which removes and retains contaminants. Some media don't hold contaminants, but they do induce a change.Calcite, for instance, dissolves and raises the pH of acidic water in the process. The treated water then enters a tube at the bottom of the mineral tank, travels up the tube (known as a riser), and exits the filter through the control valve.
The control valve starts a backwash when the filter medium becomes saturated with pollutants. Backwashing is a process in which water is sent backward through the filter at a high pace. It enters the tank through the riser tube at the bottom, then travels upward through the filter medium before escaping through the control valve at the top. In addition to washing away accumulated contaminants, the quick upward flow fluffs and resettles the medium bed.
Flow and Backwash for Various Filter Media
For many of the media most typically used in backwashing filters, backwash and flow rates are provided below.
If you're thinking about getting a backwashing filter, you should know this!
Backwashing filters are challenging to size since most filter media demand a far higher backwash flow than the service flow they support.
The amount of flow and the amount required to backwash the media are decided by the surface area of the media, which varies based on the tank diameter, rather than the overall area (cubic feet) of the media.
A filter tank with a 12" diameter can handle far more gpm (gallons per minute) flow than one with a 10" diameter, but it also requires a lot more backwash water.The filter will not work effectively if your well or city water supply does not provide enough water flow to meet the backwash requirement.
Filter consumers have a tendency to assume that their water supply will sustain any filter, and that bigger is always better. That is not the case!
A 10" or 12" diameter tank is the limit you should consider for most household scenarios. If you require additional service flow, putting two smaller filters in parallel rather than in series is usually the best option. (A parallel installation means that half of the water flow goes through one filter and half goes through the other.)
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