Are you using multi-purpose solution for everything? Considering they are significantly more expensive than saline solution, there is an opportunity to save money! If you replace multi-purpose solution with saline solution when rinsing the contacts, you can reduce your usage of multi-purpose solution significantly. Try it and let me know if it works for you!
Bausch+Lomb Saline Solution: https://amzn.to/3ajVCKD
Bausch+Lomb Multi-purpose solution: https://amzn.to/3NV9Ajv (the cheapest named brand you can get without sacrificing quality, many house brands actually stings my eyes)
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