Chlorine. Lodine. And quaternary ammonium compounds (quats) are three approved sanitizer concentration it is recommended to use? Test strips. A clean wooden chopstick

It is recommended to use test strips when using the Quat solution because it doesn't always come in the right concentration.

Test strips help to check this. Sometimes, the water with which the solution is being diluted already contains other chemicals which can enervate the potency of the quat. Other times, the Quat itself comes as an already weaken solutions.

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a. the man as a ruler

reading poetry is challenging when you don't have or very little of social context and culture schema.

solution: read the introduction, the norm, or even explaination if you still dont get it.