What is backwashing and why is it necessary?
Backwashing is the process which cleans sand filters. The first step in backwashing is to unplug power to the motor. Then, turn the handle on the top of the valve from “filter” to “backwash.” This reverses the flow of water and instead of spraying water over the sand, it pushes water down the standpipe, which forces the sand to be flooded with water, essentially lifting all debris out of the sand and filter. During this process, you should watch the sightglass carefully; you will first notice dirty water in the sightglass, then, after about 3-4 minutes, the water should be clean. This means that all the debris is out of the tank. Then, unplug the filter, rotate the handle from “backwash” to “rinse.” Allow water to circulate approximately one to two minutes. This will clean all debris out of your valve. Then, rotate handle from “rinse” to “filter” and you’re on your way! Keep in mind that sand filters rely on pressure gauges to notify you when the tank should be cleaned. It is a good id
