HydroFLOW Pearl


An upgraded version of the reliable hs38, the Pearl is designed to protect a single piece of equipment, such as a tankless water heater, from the effects of scale and decrease the risk of waterborne biological contamination. Other popular applications include small studio apartments and recreational vehicles (RVs). The unit fits Copper/PVC/PEX pipes up to 1” outer diameter. This is a do it yourself (DIY) product, but professional installation may be available in your area.

(Avg 4.7 out of 5 stars)
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The Pearl is a descaler for small apartments, RVs, and tankless water heaters. It is designed to protect your heating system, as well as appliances such as dishwashers and washing machines. The device fits Copper/PVC/PEX pipes up to 25mm (1") outer diameter. 


Popular Applications 

  • Small homes.
  • Apartments.
  • RVs.
  • Tankless water heaters.


Main Benefits

  • Dissolves and removes existing scale.
  • Prevents new scale accumulation.


Financial and Environmental Benefits

  • Reduces energy consumption.
  • Increases the efficiency of water heating equipment.
  • Replaces salt-based Softeners.
  • Average one year payback period.


Additional Benefits

  • Non-intrusive and easy to install - no plumbing modifications required.
  • Propagates the Hydropath signal along with the entire water system.
  • Provides 24-hour protection.
  • Does not interfere with other electrical systems.


Installation of this device does not replace periodic equipment preventative maintenance procedures, such as purging of your water heater. 


HydroFLOW residential devices are designed for ease of installation. With this said, it may be necessary to have your unit installed professionally, depending on the configuration of your plumbing system. 


For additional technical information about these products, please visit our technology page. If you have any questions or wish to locate a local representative, please contact us.



Data sheet
PSU Input 100-240V AC 50/60Hz 0.3A Max
PSU Output 12V DC 150mA
Unit Input 12V AC/DC 47-63Hz
Unit I/P power Typical 1.2W
Height 110 mm
Width 70 mm
Depth 60 mm
Weight 169 Grams
Max. Pipe Diameter 25.4 mm OD
Lead Length 3 M
Indicators Multi LED Operation Light
I purchased this for my condo. All the issues with scale now just simply wipe away.
Scott Simpson
Not big enough
Bought this and I didn't see it wasn't meant to be installed on an entire home. It's a point-of-use product. I upgraded to the s38 model and will update my review once I confirm it works.
Does what it says. I needed something that would help with scale crusting up my heaters element causing it to not heat the water anymore. Since installing it 4 months ago I haven't had any scale on my element. Very happy with my purchase.
No idea what unit to get
When I bought this unit I had no idea what size to get. I just noticed the product selection tool and should have used that to figure out what to buy. Turns out I should have bought the s38. Oh well I'll give this to my kid since she lives in an apartment
Got rif of my water softener and installed this on my condo. So far it seems to be keeping scale a reduced level. Happy with the results so far.
Tried this out on my apartment 6 months ago. Scale still appears now and then but its soft and easy to wipe up
First 3 months
So far I'm happy with the results. Hard water crust on the faucet and water heater has dissapeared. I did add a shower head filter to help with impurities.
Easy install and seems t be working
I just finished installing this product. It's super easy to install so when it comes to installation this product gets 5 stars. I can't tell yet if it's working so I will come back in a few months and update my review. For now, I can only give it 4 stars until I run it for a few months. So far so good.
Sean Michaels
Perfect for my apartment
I live in a small studio apartment and we have terrible water. I installed this unit 3 months ago. It was nice to see it start working immediately. All the issues I was having because of the hard water went away. I'm so glad it worked because I really didn't want to use salt to make the water hardness manageable.
Steve Poole
Tankless Water Heater
I'm not the most mechanically inclined person and I'm not comfortable taking apart my tankless water heater to clean it. We have very hard well water at my house and I was having to get my tankless water heater professionally cleaned every 6 months. So I decided to buy one of these units 3 months ago I've periodically inspected it every month and so far no scale at all!