Hi I live in Malaysia, I recently bought and renovated an abandoned property high in the hills 1300meters asl. We also dug a large pond for personal fishing. The pond is 120 feet long 32 feet wide at the widest point and 5-6feet deep. It is a concrete pond and has been running for about 18 months right now. The contractor it seems had no idea what he was doing and has put what seems to be a large but not big enough filter arrangement at one end somewhat like an aquarium filter with 4 Chambers all same depth as the pond. The first is water in but empty of filter material, the second and third are 75% filled with rocks and then have many many bags of bio rings on the top. The second compartment also has filter cloth on the top of that. The last compartment has the two pumps and UVC lights. There is also aeration at both ends of the pond providing some element of circulation. The water is murky and I have to clean the filter cloths daily to prevent them from clogging. There has to be an alternative way to keep this pond nice, attractive and clean. Can you advise me please?