I wish it would be just a 5 minutes job...
However, in your SM, there are 2 more inspection hatches (there are 3 compartments in the water tank, so, 3 inspection hatches). One is located under the fridge in the galley, the other one is located under the deep freezer.
Removing the fridge to get access to the aft hatch is rather easy.
In order to remove the deep freezer, you first need to disconnect the compressor from the evaporator thanks to the valve fitting connectors (there is a valve inside the connector to prevent the gas from escaping). Then you can remove the whole freezer container by undoing a few screws.
For me, a thorough cleaning of the SM freshwater tank takes one day work...(a bit less on a Santorin and Maramu).
Also agree with Michel. While tank is empty, you can also check the heads of the keel bolts for corrosion
A very simple solution! (grin)
Michel btw warned me against using a pressure washer of any sort since it can lift the tank coating causing flaking and problems down the road.
Remove the tank cover and using your wet/dry vacuum cleaner, suck out the tank bottom.
Takes 5 mins
Has somebody a good Solution to clean the watertank on a super Maramu
I cannot find any remark in this Forum on this Subjekt
Thanks Paul sm328