246. Immersing Wood or Ceramic

37:2 Since utensils must be immersed only in a place that is suitable for a woman’s immersion following her monthly period, one should make sure not to immerse utensils in rivers that are overflowing because of rain or melting snow. This is a common problem before Pesach as rivers tend to swell at these times and people have extra utensils to immerse. Nevertheless, it should be avoided.

37:3 Wooden utensils do not require immersion. If they are held together by metal parts, they should be immersed without reciting the blessing. Earthenware vessels also do not require immersion. If they are glazed, they should be immersed without a blessing; this is also the case with porcelain.