Just depends how you prefer to care for your equipment. Water will cause rust to the rim over time. Rim guard will not.
I appreciate any & all input & love to analyze all views, but for me it's not really a matter of caring for my equipment. It's about what is the most practical & cost effective for the long haul after completing a thorough analysis of viewpoints, facts, beliefs, & finally, real world experiences regarding whatever subject is in question.---
I ran straight water in a Kubota I owned for 10 years. While 10 years isn't a particularly long time, there were no signs of rust noticeable on the exterior of the rims other than light surface rust from paint wearing off. When I sold that particular tractor, the buyer had to haul it a long distance so we drained the water from the tires. The water did not look rusty. Interior of the rim? Dunno. I've had people tell me they ran straight water in their tires for 35 years & it did not rust out their wheels. I've read many threads where the old timers chimed in saying the same thing regarding straight water. Based on my actual real world experience & disregarding anything I've read or been told, I know I will get at least 10 years of service out of my straight water filled rims &probably more. ---
What does a set of rims cost for this machine versus the price of Rimguard? I'm thinking I could actually replace the rims cheaper. If I had a serious flat & lost my rimguard, I'd have to replace it= more $$. Being in Florida, freezing isn't an issue for me. Rimguard is obviously a good product, has more weight per equivalent volume of water, but has only been on the market for about 15 years & was not available when I owned my Kubotas. I'm sure that you are correct that water will cause rust over time. The question for me is what does 'over time' really mean ? I've heard/read all the stories on calcium chloride, I could definitely see salt water causing premature corrosion. I'm going to start with a homemade ballast box setup first & then go from there based on my results.---
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Estimating my rim life with straight water filled rims ( 10 years minimum ), having the ability & convenience to drain & refill at no cost (flats, etc.), & realizing that I can purchase a set of rims for about the same price as a one time shot of rimguard, I come down on the side of straight water. My viewpoint comes from owning/operating multiple types of rubber tired equipment with my business for 20 years & running other peoples equipment for 14-15 years prior to that.