So you have 100,000 liters (about 26,000 US gallons).
You'll need to tell us more because there can be many causes to grey, foggy water.
I'm not the metals expert--we have a few, but before anyone can give you reasonable advice you'll need to give us the results of a number of standard tests:
FC--Free Chlorine
CC--Combined Chloramines
TC--Total Chlorine (since TC=FC+CC, we only need 2 of the three)
pH
CH--Calcium Hardness
T/A--Total Alkalinity
CYA--Cyanuric Acid, aka, Stabilizer/Conditioner.
Given that you think your problem is copper sulfate, we should see a test of copper levels and, if you can, iron levels in the water.
A local pool store should be able to test for all of those things but remember to get them a VERY fresh sample of water.
We also should know if your pool is vinyl-lined, fiberglass/resin, or a concrete/tile/plaster hard-sided pool. We also should know what size pump and the size and type of filter. If you have any chemical adding systems, such as an in-line chlorinator, salt-water chlorine generator, ozonator, etc, and how you generally chlorinate your pool.
Hope this helps.
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