Hello! I have recently purchased a house that came with a medium sized pond. Its approx 7ft x 7ft and 4ft at its deepest. Max volume is app. 1,200 gallons, however there is a ledge all the way round which will bring that down a fair bit. Its been neglected for many years by the previous owner and needs a good clean as there's app. a foot of sludge at the bottom! There is a bottom drain installed which leads to what looks like an old water tank through a 4" pipe. The tank is full of little rocks that look like fish pellets. This is then pumped back in to the pond using an old central heating pump, through a UV clarifier. The pump and UV are both knackered and will be replaced. Do you have any recommendations on what equipment I should be looking at? Can I just get a new dry pump, UV and media for the water tank or should I be looking at getting something purpose built like an EazyPod? In terms of stocking levels, we will just be looking at 15-20 goldfish and 'maybe' a few koi in the future but unlikely. It will be more a feature as we have very little knowledge of ponds! Thanks in advance.