I live in Iowa, just uncovered my 15000 gallon pool and it's green. I put in 6 bags of shock over 3 days and now it's a milky cloudy greenish color. Have filtered for 3 days straight, stopped to see if it would fall to pool floor but no luck. It's a saltwater system but we had to fill it first so haven't started the salt. Readings from test trips show between 6.8 and 7 2 pH, 3ppm of free chlorine and 80 ppm alkalinity. I just bought liquid pool shock and wondered if I need to continue to shock it or get something else. Thanks