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.
Block homes can tell you very quickly if they are stressed out just by the appearance of the mortar joints. Those giant unsettling cracks can and do tell a story. This does happen and mortar cracks maybe 10-years old. You need to investigate further.
Plumbing problems can be a real headache but so can looking for a good plumber to fix them! There are so many plumbers in every city or town you may local water heater repair service be tempted to pick one at random and deal with whichever company was under your searching finger in the yellow pages. This isn't usually the best way to find a reliable plumber you can work with on a regular basis.
When your drains are clogged do you go get the drain cleaner, do you look for a plunger, or do you get out the snake? Don't know which is best? Don't feel bad, most homeowners don't. That's because plumbing can be a complicated subject. For something as simple as a clogged drain just about any of those options will work to an extent. Obviously some of them will work better than others but which one really depends on the clog. For more problematic issues you might want to consider bringing in the professionals.
Fiberglass pools never require draining for cleaning, which is a huge chore. In addition, to clean the fiberglass surface, all you need to do is vacuum the bottom of the pool, which takes only 10-15 minutes a week. At first you might think that concrete/gunite pools are the most stable however fiberglass pools can flex about two feet without sustaining any damage clog and can safely withstand more external pressure than concrete/gunite pools.
The technology in this industry is changing and evolving almost monthly, with recent introductions like the infusion of Carbon Fiber which adds extreme strength, and some pretty nice looking colors, this makes this worth a closer look than in the past.
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.