Ok I am relatively new to this. My husbands method of pool care is dump a lot of chlorine in until it is bluish and then dump a lot of clarifier in until it is clearish. We have an IG gunite pool 28000 gallons. We have a Hayworth sand filter. This year we had emptied the pool to do some tile work so it sat empty a month or so. We had it filled with pool water, chlorinated and it has been great. While the pool was down we had the pool company come replace the sand in the filter. All has been running well. When I went to vacuum the pool today huge clouds of brownish/green came out of all the filter things in the pool. It is disgusting. Now my pool is cloudy and a lovely shade of greenish/brown. It had looked fine just some dirt on the bottom. Anyone know what is wrong and what I can do to fix it? My kids birthday part is in a week and we want the pool clean. Thank yo so much in advance for your help!