Not a good way to save money!

In case this would help someone else, i’ll share what i learned today! I thought i was being thrifty and saving pennies by reusing reservoirs, and tubing with my pump. Have had this pump for YEARS and just learned that the plastic attracts something within the insulin, adn after 3 days it is much less effective. This explains (duh) why i could do exactly the same thing on 2 different days and have dramatically diff results. I’d heard to change sets out, but figured it was to make us purchase more product.
Now, have been diligent about changing plastics, and while there is improvement, is still really hard to get stabilized!!