This is a good, easy to understandy mite guide that does a nice job of explaining how to do a mite wash and at what threshold to treat. The mite treatments recommended in here are all soft treatments, and all are considered organic.
This is a really good guide, a bit more in depth, the back contains all of the current approved mite treatments and an evaluation of them.
honeybeehealthcoalition.org/ wp-content/uploads/2017/01/ HBHC-Guide_Varroa-Mgmt_5thEd_ Jan-10-2017.pdf
Thinking about being treatment free? This will help explain why you should at least monitor your mites (because your bees DO have them). It explains why normal commercial stock will likely die, and how without monitoring they are likely creating mite bombs and adding to the demise of the neighboring bees and likey ferral bees as well.