Screened stone dust sounds like another excellent ballast material. And so does the dustless clay cat litter. Especially if it matches well with FasTrack. I've seen roofing granules used as ballast, and that material really impressed me with how great it looked. And a five gallon pail of it might set you back $15 - $20 tops. If I were in need of ballast material, I'd definitely use one of the low-cost ballasts presented in this thread. Good to see that we have so many inexpensive options.
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