How to Shock a Swimming Pool and The Best Pool Shock to Use
What is Shocking a Swimming Pool or Spa? Shocking, sanitizing, or chlorinating a swimming pool or spa is adding chlorine to a pool or spa water to raise and maintain free chlorine (FC) at the recommended level of 2-3 ppm for non-saltwater pools, 3-4 ppm for saltwater pools, and 3-6 ppm for a hot tub.…
Read more
English 
Chinese