Why was reverse osmosis system installed as a result of the lawsuit ineffective at filtering the water?

Because this way the filter was able to filter out glycol ether, avoiding any contamination.

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Reverse osmosis system filters out Minerals from water

Explanation:

Reverse osmosis is a process whereby a solvent like water passes through a porous membrane under a hydro-static pressure than is greater than the usual osmosis pressure that would have been applied.

Water gotten through reverse osmosis lacks the necessary minerals required for the metabolism of the body cells, growth and vitality (this was why it was installed as a result of the lawsuit ineffective at filtering the water). although when we consume water that lacks the essential minerals it doesn't actually harm the body system in the process.