Personally, I would be happy with the hayfield test...then double or even triple the tonnage suggested and brodcast it directly into the pond/and immediately surrounding areas..You really can't over-lime a pond. The lime may be enough to clear your water, but do NOT try the vinegar!!!. Don't expect the ime to clear anything for several months though and you may still waish to use the Alum?HYDRATED lime combo for near instant clearing. Nothing will keep the pond clear if you have mechanical mixing issues or if there are exposed clay areas near the pond in your watershed.