02/03/2022 Bottom deposit has dropped 3 to 4 liters, again. pH was up to 6.2 and EC has dropped to 1.5 (I guess they consume well the nutrients, if it was only evaporation EC should rise). I decide to wait tomorrow to refill and adjust, pH will rise probably to 6.4.
I have now some doubts on the remaining space to rise up the light and defoliation of the bottom of the plant.
28/02/2022 Back from WE, everything fine, good smell already. Bottom deposit dropped 4L, pH up to 6.3 Ec dropped to 1.35. I just lowered the pH to 5.8 and tomorrow I fill again the bottom tank and adjust nutrients to 1.7 again.
26/02/22 Tank filled. Adapt nutrients solution to 1.7 EC then wait 24h, bottom solution dropped to 1.5 EC, set pH to 5.8. Will leave for 2 days and not attended... so that would be surprise to see Monday night how pH and EC have evolved!