Amounts are the standard industry figures per 10,000 gallons and assume typical conditions; pH moves depend on alkalinity, so add half, circulate for an hour, and retest. Never mix chemicals, and never add water to acid. Follow the label on the product you are holding.
Try Orbit on your route for 30 days.
Add your clients and your techs, run a week. If it does not earn its place in the truck, nothing to cancel and nothing to pay.