"Next is the priming of the filter, which a lot of people have trouble with. Assuming that the filter is empty and clean, make sure that the outlet pipe is completely free from any water as this will stop the priming of the filter. (Even if there is water in that bit of pipe that goes into the tank, you know the bit that has the U bend in). Now leave off the outlet pipe which comes off the filter box and with all taps on (if taps are fitted) give the outlet a good suck, (a spare piece of pipe helps with this). Then when you hear that the water is flowing into the filter box, you can put the outlet pipe back on. Depending on the size of the filter you should have plenty of time to get that pipe back on, so don’t panic about it.
Another thing that could cause a problem, is the gunk that builds up in the pipe. When you see that your green pipes are black inside, pull them off when doing the next filter clean and pull a long pipe cleaner through them. Doing this will keep the flow rate up.
Keeping that Blue filter sponge clean also helps, as when this gets clogged it draws air in and makes the filter hiss.
When you have started up your filter there will be, for a while a hissing noise from the pump. To clear this, give it a rock to and fro as this will allow the air to be released from the filter.
Hope this will help, as all these things that I have written, all work for me and others that I have told about them."
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