Me again to finish original.. An old type christmas tree light string or a single electric christmas "candle" should fit thru the 3/4" openings. I will locate one before next use. It took about 30-40 gallons to get the chunks out. Evidently there was too much crud at cold inlet pipe that somehow would not allow pressure to work, but that does not make sense. Water should move the granules. Anyway, I had to put tank back in operation. I reversed the elements since the upper showed no sign of use and turned the water down 5 deg to 120 which should produce slightly less lime. I had to cut away the foam at the top of the tank that filled the anode screw opening. A big chunk of the anode was sideways in the bottom of the tank. (I also suctioned 3-4 peanut sized anode pieces, so hose ID should be at least 3/8 to 1/2"). I will drain again this summer in warmer weather and look for a brass drain with a larger opening that will allow the lime chunks to flow out and replace anode. I don't think any big lime chunks were left to need a vinegar bath/soaking. It would be expensive to pay someone to do this, but cheaper than a new tank. I thought I was reasonably informed about my WH but I was NOT. The MFGing Co would rather you buy another new tank paying extra for another lifetime warranty.