Product review (1 stars): ... used to buy this product and it would be good for months
I used to buy this product and it would be good for months.  Using the same water source the usefulness of this product has reduced to about 2 weeks.  I noticed a big decline last year in the duration of its usefulness.  This last shipment the product is ridiculous.  I think they have changed the product so they can sell more but as soon as I find another source I'm  switching.