Ben,
Thank you for assisting with this situation. I followed your advice (except I could only get 5 boxes of Mule team) and tests taken with color strips prior to shock (I did order the kit you recommended) were Hardness = 500, Tot Chl = 1-3, free Chl = 0, pH = 8.4 +, tot alk = 240 Cyn=100. I vacuumed last night and the pool is a light green color at this time. This morning I tested and results were Hardness = 500, Tot Chl = 5-10, free Chl = 10, pH = 8.4 +, tot alk = 240 Cyn=150-200.

I cleaned the filter this am. It was only moderately stained.

Please let me know the next step. Do I continue with second shock? More Mule team Borax?

Thank you,
Len