When general cleanliness of a fiberglass pool including heavy metal levels and chemical levels especially Chlorine, pH, and Calcium Hardness are not maintained properly, it is easy to find organic and inorganic stains in a fiberglass pool.
Hot Tub or Spa has a water heating system and comes in handy during winter and fall when the temperature is cool and snow falling, making swimming pools without pool heaters a no-go zone due to freezing cool water and ice. While Hot Tub chemicals are the same chemicals used to maintain swimming pools, its maintenance routine and how hot tub works is different from that of a pool; for example hot tub maintenance and cleaning, monitoring and maintaining chemical levels, and water circulation. A. Hot Tub/Spa Maintenance and Cleaning There are a few hot tub maintenance measures you need to take on...
Balancing pH and Total Alkalinity (TA) might seem difficult if you're doing it for the first time. However, this is something you can fix within a few hours if you have the right chemicals and follow necessary procedures.
Shocking or sanitizing a pool or spa is a regular process of adding chlorine to pool or spa water, to raise free chlorine (FC) to recommended levels of 3ppm for a swimming pool and 3-6ppm for a hot tub to kill harmful germs and bacteria, and to remove chloramine and other organic and inorganic materials from pool and spa water.
Always to avoid FCL issues in your pool, make it a routine to measure free chlorine level in your water at least after a couple of days to weekly and adjust the percentage setting in SWCG to increase or reduce FC level depending on the reading you find.