clear water turns milky when water is agitated

I have had my inground vinyl pool for several years. 24,000 litres. The pool water is clear. However as soon as kids jump in and start swimming the pool becomes very cloudy and you cannot see the bottom. As soon as the kids get out and the agitated water is no longer being moved the water clears again. I also seem to be going through a lot of chlorine. The issue seems to have started once I added calcium last year. Also as soon as I add any chemicals ( ph, chlorine, etc the pool turns milky white with some foam and then clears within a few minutes) Here are my parameters: Total Chlorine 3.4. Free chlorine 2.9 Ph 7.2 total Alkalinity 86 Calcium hardness 289 CYA 44 TDS 800 temperature 84 F. Thanks in advance, Lisa