RectorSeal Calci-Free 68708 Tankless Water Heater Cleaner, Easy Application, Plumbing, 1.2 lb

Let me tell you about this magical little potion called the Rectorseal Calci-Free Tankless Water Heater Flush. First off, the name is a mouthful – it's like they couldn't decide whether to call it a flush, a descaler, or a fancy spa treatment for your water heater. When you open the tub, it looks like a batch of those fizzy bath bombs that are all the rage these days. But instead of turning your tub into a lavender-scented oasis, this stuff is going to give your tankless water heater the deep cleaning it deserves. And let's be real, those things probably need it after all the hot water abuse we put them through. The instructions are simple enough: dump it in, let it do its magic, and boom – your water heater is as good as new. No more weird buildup or funky smells when you turn on the shower. Just pure, unadulterated hot water goodness. Now, I know what you're thinking: "But wait, couldn't I just use some good old-fashioned vinegar for this?" Sure, you could. But where's the fun in that? The Rectorseal Calci-Free is like the spa day your water heater never knew it needed. It's like a deep tissue massage for all those hard-to-reach places. And let's not forget the best part: you don't even have to get your hands dirty. Just toss it in and let the little fizzy guys go to town. It's like having a tiny cleaning crew working tirelessly inside your water heater. So, if you're tired of dealing with mineral buildup and want to give your tankless water heater the royal treatment, do yourself a favor and grab some Rectorseal Calci-Free.

I’m very happy with this purchase. The RectorSeal Calci-Free Tankless Water Heater Cleaner worked really well and was easy to apply. It did exactly what it’s supposed to do and helped clean my tankless water heater without any hassle. Shipping was fast and the product arrived in great condition. Very satisfied and would definitely buy again. ⭐⭐⭐⭐⭐

This product worked very well, easy to use, not much odor, barely noticed it.

I did a flush on my propane on-demand water heater for the first time after 4 years of use. When I added this to the mix water in a 5 gal bucket, it off-gassed with a nasty smelling gas that I was not expecting, and I almost took a big whiff of it before I realized what was happening and turned my head away. There should have been a warning about that...be very careful of the vapors when initially pouring it into the water. The crystals then fell to the bottom, it has to be mixed in physically to dissolve all the crystals. Because it creates an acid solution, use a plastic bucket and plastic or wood to mix, do not use metal. I then ran this through my WH for 20 minutes as instructed. It went in clear and after 20 minutes I had an orangey-pink solution with some orange particles in the bucket. I used rubber washer hoses with brass hose ends. The 2 hose ends that were submerged in the bucket corroded during use, turned from a shiny brass gold to a dull grey color. I would consider the WH flush project a success, judging by how much scale ended up in the acid solution. Also, be careful how you dispose of the waste solution - it is a pretty strong acid so it will eat through metal, stone and concrete. I looked it up after the fact (should have done this before) and discovered it is just "sulfamic acid" crystals under a fancy trade name and in a fancy container. You can buy the same sulfamic acid off the shelf at a store for 1/3 the price, which is what I will do next time. Poor value for the money when you consider alternatives are readily available, but it was effective for flushing my WH.

The product worked fantastic. I had not cleaned may Instant hot water heated in 10 years of operation. It was giving clean me codes (1P) and the flow had reduced by 75%. I didn't realize it until after it was clean. It took a little longer but my buildup was bad. One recommendation, Make sure you remove the filter on the cold water inlet side or clean it frequently while circulating. Mine could not be removed because I didn't have a dummy plug. It took me a while to realize that the filter kept getting clogged during the cleaning process. It works great. Be careful with the solution after use. It turns things green.

Work great

Holy wow! Our water is high in Ca and Fe. The crap that came out of my water heater was brown and gritty. Great product! Works as described.

We spent $325 wasted money on a service call. The guy flushed it with vinegar which did nothing. With this product the water came out black. Now the heat is consistent. I think those people who say not to use it just want you to buy a new machine. Highly recommended. Too bad though it’s so expensive.

We have instant hot water heater & it needs to be cleaned to prevent hard water build up. We borrowed from a fried & replaced it with this product

Didn’t work well at all on my tankless on demand hot water Probably Get the same or better results using vinegar