Well, the pool holds Cl overnight. Tests at about 11 AM this morning:

pH 7.2
ppm Cl no bleach added yesterday evening 5
ppm tot Alk 120
Cyanuic acid 30 - 40 ppm (I haven't found locally a proper test kit, I'm using strips)

I've added some calcium carbonate to raise the pH to 7.5 - 7.6

The pool is still cloudy, but no green, even after running the filter 24/7 for well over a week. Any suggestions? Time for flocculant? Any other ideas? This problem is getting depressing....