Sorry to hear of your problems as I've had one of these units (a Seagull iv) for 4 years now and I've never had any problems. When you say the cartridge stopped working, do you mean that it would not allow any water through? If so, I take it that your current flow rate is starting to drop off. From memory the life of one of these filters is 7,500 litres and I can't imagine you've used over 15,000 litres. There can be only two possible problems; either the pump isn't producing enough pressure or the filters have blocked. I take it you've installed the right diameter piping. It's very hard to check that the pump is producing enough pressure but even though logic would dictate that the problem lies in the filter, my money would be on the pump. Can you connect an open pipe to the pump and check its flow rate and compare it with someone elses? I would check out the pump's pre-filter and give it a thorough clean too. Provided you can verify that the pump is truly producing the right pressure (and pressure is the key not volume pumped-bit like volts rather than amps) then the answer can only be with a blocked filter. I suspect you can't clean them and your only option is to get a new filter. I've never heard of anyone else having such a problem which is why I'd bet that the problem lies with your pump rather than your filter. Are you sure that produces a high enough pressure?

Q