To qoute a website I was recommended to read on this topic:
- Unplug the filter and shut off all of the valves.
- Now, disconnect the valves and take the filter to the kitchen.
- Grab a bucket and set it in the sink. Place the filter on the counter so that the lower valve-stem hangs over the bucket at the edge of the sink.
- Turn the lower valve stem counter-clockwise and point it down into the bucket.
- Open both valves and empty the filter’s water into the bucket.
- Now, close the bottom valve. Then, undo the clips and lift off the lid and set it aside on a towel for now.
- Take the bucket of filter water out of the sink, leaving the valve stem pointed into the sink, open the bottom valve again, and slowly pour the water into the top of the canister. The water will come three times dirtier than the first time. This is because you are back-flushing the filter media - sending the water in the opposite direction that it normally flows.
- When the filter has emptied, close the bottom valve again and turn it clock-wise back up.
- Now, is a good time to check the top layer of filtering media (it’s right there), EhfiSynth, and see if it might need replacing. Also, it’s a good time to pull out the instructions and follow the procedure for cleaning the impeller. You kept your instructions, didn’t you?
- Wet the O-Ring, and slide it over the bottom of the lid and press down.
- When you’re done, take the filter back, hook up the double taps, open the bottom valves first and then the top valves. The filter should fill up again on its own (no need to start the siphon manually). When it’s full, plug it in. You’re done.
