You should be good with the 5:1:1 mix for a year, easy. Two years is as long as I leave plants in it, but I suppose you could stretch it if you had to. The gritty mix (1:1:1) is 2/3 inorganic (mineral) and more appropriate for long term plantings.

Pro-TeKt is a K supplement + silicon, so be sure you don't skip the other nutrients, thinking the Pro-TeKt is all you (your plants) need.

Al

Here I go again once again... gritty mix is made of what? bark and what else? proportions? can you provide quick formula on that mix. many many thanks in advance

1:1:1

1 part uncommposted fine pine bark
1 part Turface
1 part grushed granite (Gran-I-Grit 'grower' size or Cherrystone #2)
gypsum

It's all in the link below.

Al

Here is a link that might be useful: All explained here