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Hi Tom, Was the "water" inside previously a calcium chloride solution? If so, the tire really should come off the rim altogether for additional rim investigation and possible repair. If not, I would see if I could get the interior as dry as possible. Is the bead completely broken down? It will need to be to install a tube. If you are planning to install a calcium chloride solution, you should ONLY do so inside a tube, IMO. You might also want to check out this post and the whole thread that it is in, including reference links for some background. You really don't need anything special for a "recirculation" pump. I have used a small general purpose pump that uses garden hoses on both suction and discharge for filling and draining. I have also done the job without a pump at all. To do it without a pump, you will need to mix up the solution in, say, a 50 gal drum (with a bottom drain fitting for a garden or other hose) and be able to place the drum bottom above the top of the tire so the solution can drain in by gravity. This is slower but works...you just need to get it up in the air. I have used a front loader bucket for this purpose in the past. Does your water adapter look like this?. If so, you will want to start with the valve stem at top vertical center. As the liquid is pumped or drained into the tire, it displaces and compresses air that was in its' place. The pressure inside the tire will slowly build up and the flow of liquid into the tire will slowly decrease. Every once and a while, stop the pump or shut off the gravity flow (with a valve you should have installed if you go the gravity route) and depress the little button on the side of the adapter. Don't block the small hole with your finger. This will let the air out and you can go back to filling the tire. You will have to do this several times if you go the gravity route. Don't fill above 3/4 full. You can determine this by keeping tabs on the gallons used compared with those in the charts for your tire size as well as noting when liquid begins to be expelled out that little vent hole instead of air. You should be able to get 77% calcium chloride flake at any farm store. Many will say you shouldn't use CACL because it eats you rims out. Indeed it can if you are not attentive to detail. I have used it successfully for over 30 years in two of my tractors (both front and rear) with no significant problems. You just need to always use tubes, even in tubeless tires, and repair any leaks rapidly, particularly in the valve stem area. Even leaks past the stem valve itself (normal after a few years) can cause problems if not corrected promptly. Good luck. Careful you don't pinch the tube when reseating the tire :o).  Rod
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