Like Camille I dunk my orchids that are in bark for watering/fertilising, leaving them in for about 30 minutes. They have had this treatment twice now with Kelpak. (4ml/L) All are growing lots of strong roots but best of all one that I had been delaying repotting, which it desperately needed, has grown 4 good roots in the last few weeks, giving me the confidence to do the repot.
2 new roots on this side and 2 hiding on the other.
Out of bark and soaking in Kelpak prior to repot.
My ones in S/H get a plain flush and then a refill of the mix. All doing great roots.
The only one I spray is a vanda in a glass vase. It takes 10L to cover all the roots so instead I allocate half a litre in a spray bottle and work at it all day. When the bottle is finished I then top up/fill the vase with plain water and let it soak overnight
I'm delighted with the Kelpak.
It all gets a second life in my garden for seedlings, cuttings and new plantings!