1 In general, the total dissolved solids concentration is the sum of the cations (positively charged) and anions (negatively charged) ions in the water.  Parts per Million (ppm) is the weight-to-weight ratio of any ion to water.
If you refrigerate the rice, and you want to eat it cold, its perfectly fine. People eat cold rice salads all the time. Cold rice pudding is fine. Its just sitting around at room temperature that is the problem.
How to survive a bowel prep. Many of us have endured this process before you, and here is what we have learnt: Prepare yourself mentally! Decide youâre going to do it, and just do it! Eat lightly a couple of days before the bowel prep. Eat more fruit and green vegetables and reduce meat and dairy products. This will make it easier for your bowels to empty. Some find that the mixture tastes best ice cold. One way to cool it quickly is to put it in the sink with ice all around it.