I live in a London flat with my Peace Lily - unfortunately the leaves are getting burnt tips, not as they grow but once they've been around for a while. The plant is about 6 months old, I am no longer providing any extra nutrients, but was when it was initially replanted - and burnt tips were happening regardless.
I water it sparingly and try to 'flush' out any mineral deposits once every two months by letting plenty of water sip through the soil.
I water it with the normal London tap water.
It sits in a North facing window with no direct sun light.
Grateful for any ideas of how I can improve the life of my Peace Lily.