Product review (5 stars): A necessary evil
I've been going through quite a bit of this since its purchase 6 weeks ago but my forced air heat has been blasting away steadily since we've had some pretty cold weather, December into January esp. I did measure initially to get the proper amount needed for each of my humidifier's two slightly over 2 gal each tanks using&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Rienar-White-3ML-Disposable-Plastic-Eye-Dropper-Set-Transfer-Graduated-Pipettes-20-PCS/dp/B00P7QZDK4/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Rienar White 3ML Disposable Plastic Eye Dropper Set Transfer Graduated Pipettes (20 PCS)</a>&nbsp;to transfer the solution from the bottle to the tanks each time.

I still get mineral deposit build-up on my wick-filters which I switch and reverse almost daily despite being sure to use the proper filter for my unit, so I'm counting the number of weeks until I can dispense with using the humidifier in mid-April.