Good plumbers are going to have a valid license that you can check on. Look up the number they give you online and see trustworthy drain leak repair if it is valid and if any complaints have been filed against that number. This will tell you if they are at least good and have not done anyone anything wrong. Some of the best plumbers are going to know and understand the local building codes and will be able to explain to you what is needed for the job to be in code.
This is a highly specialized job and you might not know exactly what to do. Many DIY enthusiasts end up creating a bigger problem than before when they try their hand at repairing kitchen or bathroom leaks. An experienced plumber, on the other hand, will be able to solve the problem easily. This person will also be able to identify potential problem areas and pre-empt any issues there.
It would be good to have a couple of people around while the process is being done just in case there are accidents since acid is a very local water heater repair service hazardous substance.
Understand who warranties what. For instance, who warranties the pump and filter? The manufacturer or the dealer? Who do you contact to report problems? Do they have a toll-free number? Who comes out to fix the problem? In some cases, each individual manufacturer will warranty each separate piece of equipment and will have different service providers fixing the problem. There's rarely a one-stop solution for pool warranties and service.
Don't drain repipe jam everything into your jewelry box. A crowded jewelry box means items can easily be damaged or misplaced. If your gem is truly valuable, it merits appropriate storage.
Purchasing a pool can be a scary experience, especially for those first timers who haven't been through the process. There are a myriad of items to consider... pool type, maintenance, warranties, contracts, liability, plumbing, landscaping, electricity, drainage, restrictions, accessories, and so on. It's no wonder many pool buyers make mistakes that end up costing them hundreds, even thousands, of dollars.
Finally, at the beginning, take the time to get quotes from several plumbers and potentially on non-emergency, lower cost jobs. Get a feel for the plumbing company and see how well they fit with your needs. Meet the plumbers in person. Then, when an emergency plumbing problem arrives, you will have a much better solution when time is of the essence.