They are the only dealer I by from. I have purchased four machines from them. They are great on warr. I am not an employee. E-Mail me if you need any info, or I can help further. He is building me a 8gpm hot water machine this week.
I use Oxalic Acid. It is the base material for Rust-Aid and most rust removers. Depending on the concentrate, dilute with water and apply with a pump up sprayer.
I agree with JP above. I do a written proposal for all my large jobs. It protects me from them claiming extra's. We are clear on the scope of the job before we start.