Look at the test results that Ben/ewest posted. Compare the values that you have to the ones in the test. Your hardness is off the charts, high is anything over 400. pH is borderline very high (9.0+), something should be done to drop that in the pond closer to 7. To convert mg/l to ppm just change the name. i.e. 1500 mg/l is 1500 ppm.

Compare the optimum and high readings on the TAMU report as they compare to yours. I doubt that a filter would take care of all your problems, you most likely will also need to change the chemistry of your well water.

I combined your two threads about the same question to one place to avoid having to compile answers from two different places.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).