OK, I just wanted to update this thread. My pool is sparkly clear, and all I have been using is the BBB method and keeping a close watch on the chemistry.

It took the sand filter about 2 weeks to clear the water up once I got the FC up to the right level. I added 10 large jugs of bleach, which brought the FC up to 50+, and then within two days it was between 10-20ppm. After that it went down below 6 ppm, and the water got better every day. I am also a big believer in 2-speed pumps. I run mine on high for 2 hours in the morning and then switch to low for 10 more hours.

Still have not installed the BW flowmeter, it's on my list.

Thanks for all your help.