I've just opened my 19,000 gallon IG pool with 4 ft and 6 ft deep end and there is 0 chlorine and CYA is below 30 and PH test was yellow TA was 10 ppm, I filled half the pool with Detroit city water so that accounts for low levels. My pool is clear so I was curious if I need to SLAM the pool or just get the pH fixed, CYA up, and bleach. The pics below show the water and this was opened and filled 2 weeks ago. I figure the water should be SLAMmed because it sat so long, but it has been cold in MI and the water looks good so I'm not sure what action to take. I appreciate all insight!