Hi Ranga and I reckon that battery is beyond recovery but give it a try.
Next time you need water for a battery, use distilled water. Tank water has contaminates in it, including metal if it was collected from a tin roof. Also, never use it to top up a radiator for the same reason.
Anyway, back to your battery. Even if you do recover it, it will most luckily be way down on capacity.
But just keep applying your charger every day or two and it might give you some use.
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