Hopefully someone out there can help me i have a 1.75 acre pond which is 2yrs old. this yr. i have had a problem with water clarity and planktonic algae.I have treated the pond with earthtec at the recommended rate for the algae with no improvement i have also used microbe-lift aqua-c at the recommended rate with no improvement and have also used dyeall with no positive results.I had a water specialist test my water today with the following results ph7.3 dissolved o2 11ppm,alkalinity 40, hardness 5gr/gal or 85parts/per million, nitrate 4parts/million, copper o iron 6parts per /million, amonia .25 parts per million any help would be greatly appreciated. the pond does have a diffusser type aerator system.