I am new to pool care. I have successfully balanced my pool and it is crystal clear compared to the pond it was a week ago. I am on a well and my water hardness is well beyond extremely hard. Partial draining and refilling of my water will not help. Since I have a Cartridge filter I am not sure if I can use a flocculant to lower my harness. I am not able to bypass my Cartridge when vacuuming. If I can't flock it, any other suggestions. Thank you for your help 