Peace Lily In Bad Shape

About 10 years ago i rescued a peace lily from our office. It did really well until recently. See pic from 2015
However, this year the leaves are going brown and it appears to be dying (See 2018 pic)
It's in the same place (back of the conservatory....not near a window or direct sunlight), in the same pot and the same watering regime.

Could it just need re-potting and or splitting up? It's still in the same potting mix from about 2014
Or is there anything else i should try?
Thanks for reading. I have 2 more queries which i will do individual threads for unless advised otherwise.
However, this year the leaves are going brown and it appears to be dying (See 2018 pic)
It's in the same place (back of the conservatory....not near a window or direct sunlight), in the same pot and the same watering regime.

Could it just need re-potting and or splitting up? It's still in the same potting mix from about 2014
Or is there anything else i should try?
Thanks for reading. I have 2 more queries which i will do individual threads for unless advised otherwise.

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Check that the plant is not being double-watered by helpful staff - perhaps once by a cleaner and once by someone at a desk nearby. Try feeding regularly a couple of times a year. I wondered if it might have got sprayed by accident by some kind of office cleaning spray. If you want it to flower more, it would need to be closer to a source of sunlight. Good luck with it.
It's actually at home. I took it out of the office when i rescued it.
There is some kind of white residue in the saucer and about an inch up the outside of the pot.
Errrrm i don't actually feed it. :-/ Should i ?
It's normally watered just with tap water but i occasionally put it outside when it's raining and occasionally i use dechlorinated water.
Funny you mention fish water....
I have PLENTY of that available. I have an overstocked koi pond so an abundance of water available when i flush the filters.
No good at the mo as the pond is currently salted but that's only a temporary measure.
I will have a go at repotting it this evening and take photos of the roots.
Every year they tell me when to look after them by poking their shoots up and I put them outside. They seem to like it, and flower well.
I agree with others though, they are unhappy and need repotting.
.