I understand what you mean with waste regarding the unidose tubes, but it's currently the best way to avoid contamination as others have stated. I am in the U.S. and I use this product - which is almost identical to what you use, but with different branding and casing. You can always recycle the tubes IIRC.

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Edit: Adding on - - - I have also used Purilens in the past and that was over kill. I used to purchase six, 4oz bottles at a time, but I kept under utilizing it by a landslide by the time it expired. Container states to stop using it 30 days after you originally break the seal. If I didn't I would start to notice that as time went on and I continued use of the saline, my sclerals would start to get cloudy towards the end of those 30 days. That's why I switched. Best of luck!

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