I opened the pool 2 weeks ago and it’s sparkling but I can’t get the chlorine right. It’s a 75000 gallon community pool I’ve been running for 4 years. My partner added 26 ounces of algeside last eeek and since then when I put shock in it forms a white mass for a couple of minutes and then dissipates. I went to Leslies and had the waterchecked. Their instructions were to add 28 lbs of alkalinity up- wait 4 hours and add 25 lbs of chlorine granuals. I did this last night - i checked it around 5 the next day- O chlorine and 6.8 PH? Can anyone offer suggestions?