I have hard water. Can I use Sheets products? October 21, 2021 14:22 Our sheets work in all types of water! Hard or Soft. The key to the sheets is water contact time! Related articles Do your products have a shelf life or expiration date? How do I remove sheet residue from my clothes? Are your products safe for septic tanks? Do you have customer reviews I can read? Do you have any product reviews that I can read for the laundry sheets?