My only hesitation in writing this review is that I'm afraid that once they get positive reviews (there were zero reviews when I ordered it), they'll raise their price. I'll take that risk in sharing with the community that this is a solid product with everything you need to flush your tankless water heater. I especially appreciated the fact that it comes with a jar of citric acid, while many of the competing products simply suggest you use vinegar. Not wading into the vinegar vs. citric acid debate, the fact that this kit comes with everything you need is a big plus for convenience (and value). The full jar in half a bucket (provided) of warm water, or 2.5 gallons, provides the perfect concentration you need to get the job done. I can't yet speak of the longevity of the pump. It worked just fine for the 45 minutes I flushed my unit an expect that it will hold up for the annual maintenance.
James 
