Hi. My pool is approx 5,000 gal. Fill it fresh every year with well water. High metal content causes a reaction to chlorine. Water turns brown instantly when shocked. I use stain & scale remover to treat it. Water will turn back to blue but remains cloudy. I've done everything pool specialist tell me but Never gets clear. Also have treated it wth phosphate remover. Have hard time maintaining a chlorine reading. Please help! I'm very interested in going the BBB route!