we prefer a biological ...

we prefer a biological solution.  it will be cheaper and there will be less stuff to haul away.  you want to avoid the use of chemicals.   We use a microbe reactor so you dont need to buy enzymes or microbes.  We prefer Chem5 that works well with laundry soap.  we treat it anaerobically and then aerobically, then pass through a phosphilter.  that takes away the bulk of the pain.  the phosphorus.  good luck.

and yes, you can reuse the water