this post was submitted on 12 Nov 2025
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I was in a situation similar to this one in real life: having to adjust the salt level in a pool.
In metric:
The pool is 8*4 m long and 2m deep on average, the current salt level is 2g/l and the salt comes in 20kg bags.
How many bags of salts do I need to pour in the pool to adjust the salt level to at least 3g/l ?
Answer:
In imperial:
The pool is 20*10ft long and 5ft deep on average, the current salt level is 2000ppm and the salt comes in 40lbs bags.
How many bags of salts do I need to pour in the pool to adjust the salt level to at least 3000ppm?
Answer:
Home pools here are almost never saltwater.
We simply add chlorine tabs until the pH is the correct color on the strips. Even if we knew it would be 62.4 lbs of salt, it's not like you can buy a 62.4 lb bag of salt.
But yeah, it is a lot harder to do applied math in the US, which is why science here went metric :)
It's a shame because salt water pools are honestly so much better and I think overall it was cheaper for us as well.
Instead of adding chlorine every week the salt system just keeps the chlorine level at the right minimal level all the time. So no chlorine smell in the pool and the pool was much cleaner.