The only other difference - which might be major - is that I started a few months ago using the filtered water from the fridge to water them, rather than the tap water.
Chlorine? I know that our business selling hydrofluorosilicic acid has dropped off quite a bit in recent years as more and more communities stop fluoridation. I have a stack of the kegs we used to package this in at the back of the warehouse somewhere. So perhaps your filter is taking out the flourine as well? We don't do much with chlorine based chemistry - nasty nasty stuff - chlorine is a very active oxidizer and can get released fairly easily. We do a bit of ferric chloride but that's mostly because we use it ourselves to treat our waste water.
There's a number of sulphates used in water treatment as well that your filter may be removing - if you need some - I know a guy
Oddly I have a habanero - one of the extra spicy varieties as a house-plant in the upstairs bathroom and it's been blooming quite a lot lately. A bit surprising given how cold the house is. And also the fact that it's now nearly 3 years old. I never expected it to live out a season like it's brethern that I grew outside. It doesn't seem to want to set fruit though and they are supposed to be self-pollinating. Ah well - it looks nice.
On BD H52, W50 T27, M26 S21, D23 BD-9-Mar-16 D-15-Jan-18 Final-19-Apr-18 I am a storyteller. The story may do you no good. But a story is never for the listener. It is always for the one who tells
