Product review (2 stars): Do not use if pregnant!
This product contains dimethylbenzylammonium chloride, which is a known teratogen. It has been shown to cause birth defects.

I recommend the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/ProTec-PC-1-Humidifier-Tank-Cleaning-Cartridge-Pack-of-2/dp/B000XPT0DK/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">ProTec PC-1 Humidifier Tank Cleaning Cartridge (Pack of 2)</a>instead. It contains silver and inert ingredients and is safe to use in pregnancy.