There was a 3 day delay after USPS lost my package, which is on USPS. The package arrived in good condition, and the product appeared pristine. I fresh started two cultures (Tet and Nanno) in 1/2 gallon jars... 48 oz of saltwater and 8 oz of phyto in each jar, Kessil H380 light set to "grow", and the color depth almost doubled in 24 hours (picture below). An 8 oz bottle will last quite some time using 2ml per 1/2 gallon culture every 7 to 10 days. That's a great value!