I have planted thousands of orchids in s/h and never used any of the products your are considering.
Physan 20 I consider to be a worthless compound. It is only an algaecide that they are trying to expand for sale. It does not even work well as an algaecide. If it worked it would be as a contact killer since it does not even claim to be systemic. Save your money and forget t.
Dyna-gro KLH is IAB root hormone and fertilizer. According to their literature the IAB, which is a good rooting hormone, is diluted at the rate fo 1,000,000 to 1. Because oft he fertilizer and a few other compounds overdosing can cause problems.
Super thrive is also IAB at probably higher dilution and Vitamin B1. Both products do some good but hardly necessary.
As you find Ebay is horrible on shipping. The sellers make their profits on the shipping rather than the products. USPS flat rate boxes to Europe cost about $12. I have shipped to Australia for $14.
I do use a product called Essentials with is Gibberetic Acid made from seaweed. It is the equalivent to IAB and available at a dilution of 10,000 to 1. It is also available as a concentrate saving shipping. I like staying organic whenever I can and you can not harm orchids from high concentrations. Keep in mind I said none of these are required for s/h culture.
Check out the results.
Essentials test results
Hybrid Mode
