For my 90, I made a DIY siphon hose. On the tank end there's an upside down 'U' made of PVC with an integral valve and a threaded fitting at the end of the 'U' on the tank side. I can screw in a fitting to attach a vacuum hose, and then replace that with a 'T' to disperse the water while filling.

The other end of the hose also has a valve (important) and fittings that attach to a water supply under a nearby bathroom sink. After draining the tank and refilling it, close both valves on the hose so it's full of water when you store it. That way it's ready to self-start the siphon when you do the next drain cycle.

TW