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Making Alum and MAP Crystals

My class is experimenting with Monoammonium Phosphate (NH4H2PO4)and Aluminum Potassium Sulfate (AlK(SO4)2*12H2O) to grow crystals.  I found a website where adding Alum to a solution of MAP achieved different crystal habits.  However, I would like to understand the chemistry behind mixing these two salts.  I would like to verify that:

1.  Mixing the two salts in water form Ammonium Alum (NH4Al(SO4)2) and Potassium phosphate (KH2(PO4));

2.  None of these compounds together are harmful; and

3.  If #2 is true, then I should be able to dispose the solution down the sink.

Thank you for your help-  

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