Anyone done their own hydro fluild/filter change on the above? The manual shows instructions with the hydro unit out so that doesn't really help with real world issues. I got to the filters and guards off. Then there's linkage in the way preventing the filters from actually coming off. Then there's the problem of reaching the vent plug on top of the hydro's. Any help from someone that has done the service on this unit will be HUGELY appreciated!
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