I caught the calcium defficiency in my plants a little late so I needed this product fast! I chose priority 2 day delivery with the postal service. I ordered on Thursday afternoon with an expected delivery on Saturday. The item arrived as promised by Happy Hydro on Saturday but the postal workers refused to process and give me my package until the following Wednesday. That five day difference took it's toll on my plants. Some will survive, some will not. Thank You Happy Hydro for your excellent ...