Can anyone please advise me if I can get a replacement garden pond pump similar to a Hozelock Titan 3000? The one I have now is used together with a Hozelock filter Bioforce 4500 +UVC but has stopped working, it is 15 years old. I have cleaned it thoroughly but still doesn't go. I cannot seem to find any pumps that don't have a fountain, which I do not want. The pond is about 400 gallons. Also, would it be worth trying a new impellor? Any advice would be much appreciated.