Back yard boiler been doing this for a few years now. I had a question about sap age. I have sap that I collected March 1st (23 days ago). It has been kept out in the cold since then. I have removed approx. 1/3 of it as ice. It still looks fine clear not cloudy. Is it safe to boil? If so how will it affect syrup quality? How long is too long and are there indicators that would make someone question sap quality? Thanks in advance.