Product review (1 stars): May void warranty and nearly wrecked our dishwasher
Be aware: using this product may void warranty on your dishwasher. In our situation it clogged the plumbing to the machine with tiny particles.

When I upgraded my 10-year-old Bosch 9 months ago to a newer model I added this filter to try to get good results longer and extend the life of the dishwasher with our very hard water. It was easy to install and things went OK for awhile until loads started randomly coming out dirty, soap not dissolved etc.. As a longtime Bosch user, I know when this happens to check the washer arm holes, clean the bottom filter every time, and check the air gap on the sink. But even with those precautions I was getting very unreliable performance from my new dishwasher. I changed the filter, thinking maybe it was used up, but the erratic performance continued--sometimes things were fine, sometimes not. Finally the dishwasher stopped filling all the way up and the water was lukewarm.

I called Bosch to send a tech while it was still under warranty. The tech said there was nothing wrong with the dishwasher, but agreed it was not filling up sufficiently and the water was not getting hot enough. He pointed out that the dishwasher must be plumbed directly to the hot water and there should not be a filter in the chain. He said that if the machine is not plumbed directly it can strain the dishwasher and void the warranty if the dishwasher actually broke. Whether or not the filter can affect the dishwasher (in our case it did) it is not the manufacturer's approved installation and it's an opportunity for them to void the warranty depending on what breaks.

The tech recommended removing the filter from the plumbing chain. When we did, we found small gold particles loose in the couplings. We took the dishwasher out of the wall and found these particles in the hoses. They had accumulated up against the mesh where the hose goes into the dishwasher and had nearly blocked the hose. As soon as we cleaned out the hoses and re-plumbed the machine without the filter, it operated normally and vigorously--filled with hot water, dissolved the soap, cleaned the dishes, etc. The amount of water coming into the dishwasher increased quite dramatically and we realized the the flow had probably been restricted for quite a while.

The good news: this finally convinced us to make the investment in the water softener I have wanted for 10 years.