So put the Stabilizer in a cotton sock. Tie it to the frame and let it hang near the return. Periodically go by and squish it with your hand to help it bleed/dissolve into the water. You'll see a cloud come out into the water - that's what you want, not the crystals being pushed through the sock. What type of pump do you have - cartridge or sand? If sand, try not to backwash until the CYA is all fully dissolved. Also, add the amount per Pool Math calculator and once it is dissolved, be sure to target your chlorine based on the CYA value you added. The CYA won't show up on a test for a week or so, but it will begin doing its job right away. It is safe to have the sock in the water when you are swimming - but again, if you have little kids I personally would not have them in there with a sock full unless they are old enough to leave it alone.