Stressless, You might be able to get the bentonite slurry for free. I'm not familiar with Ohio laws but it might be workable. Go out to the closest job sites where there are drilling rigs running. Contact the onsite Company man who represents the Operator of the project. Ask if he is using a bentonite mud system to drill the well. If so they have to discard or haul off the bentonite drilling fluid for disposal which costs the operator money. If laws there will let it happen, then he can discard it into your fracture. It is a win-win for both parties. His cost is for the vacuum pump trucks and he is not paying for disposal. Your cost is zero! It is done in Texas but again I don't know the Ohio laws.