I have been adding pool shock and algaecide as recommended by my pool store on a weekly basis and my pool has been ok. Recently as I added shock the powder would immediately react and a cloudy gas would form inside the water and it would come off the pool. Something is definitely not right so I started to look how to get into the borax bleach baking soda method but I know I need to solve this problem first. My chlorine values are below 0.6 ppm, alkalinity 120 ppm, pH 7.8 and pool is green with algae now. How do I fix this problem and stop using algaecides? Thanks for the advice.