The superintendent at Hamburger GC Falkenstein (Germany) was faced with similar challenges years ago. Too much organic material had built up. He sent an email with some photos:
"Please find attached a soil profile of a green and a fairway at Hamburg Falkenstein after 4 years of irrrigating with Greensafer ( Biodyzon). Even on the fairway, where we slit perhaps once the year and leave the clipping on the turf, there is no layering or thatch to see.
On most golfcourses worldwide the water quality is not as it should be. Even if you have all the knowledge in greenkeeping and all the money in the world, you will not get the best turf, until the water quality is right. On top you get with Greensafer the advantages of thatch and black layer reduction until there is not much left. Very often we leave the clippings on the green and see no thatch increase. We in Falkenstein have now not holow cored the greens with soil exchange in the last 3 years, and you see with the attached soil profile, why it is not necessarryany any more. If you need further information, please let me know.
Kind regards send Norbert (Lischka)
Like all the supers I've met...a really good guy.