Novice123

Bought my Sundance Chelsee new 9 months ago, and have fought biofilm on and off since the beginning. I now suspect the biofilm was present at initial installation (from wet test), and the problem has worsened over the past few months. Drain/purge products have not been effective in eradicating the biofilm. I have read countless posts on this forum, and used Ahhsome for the first time this weekend. Yellow biofilm evident in purge and re-fill. After second Ahhsome application, upon taking the front panel off the hot tub, vast amounts of biofilm were clearly evident inside tubing upon visual inspection (more than 50% of visible tubing covered in biofilm). I have let the second Ahhsome application sit overnight, and will tackle the drainage tomorrow. In this forum, I have read some are successful after 6 or 7 successive drain/re-fills, but am I wasting my time with purging methods for a case of severe biofilm? Should I call a tech and have the tubing manually cleaned?