The amount of Chlorine Tablets you need for your swimming pool is usually one tablet per 10,000 gallons of water or 1 gallon of liquid per 10,000 gallons of water.
So you could use 1 full Chlorine Tablet for a 5,000 gallon swimming pool which is what I do or you can even cut the Chlorine Tablet in half and put half a Chlorine Tablet in the 5,000 gallon swimming pool.
But using 1 full Chlorine Tablet for 5,000 gallons of swimming pool water is okay.