Okay guys here's the issue; 12 inches of rain in 12 hours, a third acre of green grass run-off rolled into my pool for several hours... Pool specifics; 19 thousand, in-ground pebble tech plaster, pentair 520 cartridge filter system... When I got home the pool was dark and muddy... To preface this; this happened about 3 months ago, but to a lesser degree. Pool was still dark and muddy. I ran the pump for 48 hours straight and the pool became crystal clear... Now to get back to my question, with the dark and murky water, I've been running the pump for 5 days. The water chemistry is perfect, the pool sides and bottom scrubbed and vacuumed, and a water analysis taken to the local pool store and found to be optimum. However the pool has a tint of green to it. My question is; is it possible that the grass run-off has died my water a shade of green?