I'm going to try to redo my math for processing 35 cubic metres of radioactive water per day.
I think I got lost in conversions above.

So 1 cubic metre of water weights about 56 lbs. Check!

Therefore 35 cubic metres of water should weigh about 1960 lbs or .875 tonnes. Check!

Therefore, in one year 319 tonnes of water could be processed. Check!

Since there is an inventory of 11,500 tonnes of water to be processed, it would then take 36 years to do the job, not 10 years as I posted above.

Hopefully, that answer is approximately correct. More coffee needed!

Charley Noble