Whoops! I am getting too old. What I said about TEA applies to PMK. TEA may not be alkaline enough for Pyrocat-HD.

The cloudy carbonate solution may be due to hard water, which contains calcium and/or magnesium. Their carbonates are insoluble and form the cloudy solution you described. Tetrasodium EDTA may cure it, but it's cheaper just to use distilled or demineralized water unless you have on hand the EDTA.