They did a good job....professional....showed up on time....did a good job of removing 95% of the Calcium buildup.....and cleaned up all the mess.   The actual person who did the work seemed to care about the details and really getting the calcium off.   He was here setting up and doing the work for about 7 hours...so it ended up being about $100 an hour....but the end result was worth it.    The ONLY gripe I would have is that he used a Salt material to remove the calcium....and because of this it immeditaly burned and killed most of the plants next to the pool.  Cost me about $100 and 3 hours of my own labor to replace them.   So.....when you are talking with them BEFORE they start make sure they are covering up any plants that will absolutely be burned bad or killed with the salt.  I made the mistake of not bringing it up before they started....I'm usually more aware....so lesson learned.   I would use them again for sure....but I'll make sure the guy is paying attention not to kill or burn the plants.