Kevin,
Some pics of the filters,
The two Nexus are linked together with 4 inch pipe and the pump is a 15000 sequence the CL10 is removed for the winter to allow the pond to be covered, the skimmer is a small cartridge filter powered by a 12000 sequence, the gas boiler you can see is for back up and the pipes you see to the right of the boiler are the ones from the heat pump, as you can see they were simply joined to the pipes from the gas boiler and separated with ball vales, so either one can run but never the two together.
Cheers
Andy.
