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Chemilizer™ HN55 Fixed Ratio Injector/Medicator

, HN55
Shipping: Standard
Product Name SKU Price Qty
Chemilizer™ HN55 Injector - 1:100 120177-1:100
Chemilizer™ HN55 Injector - 1:128 120177

This proportional injector runs off of water flow, rather than electricity.


The Chemilizer™ HN55 Fixed Ratio Injector is an industry-leading injector utilizing years of proven diaphragm technology. Powered by the existing water supply, the internal motor drives the chemical pump, injecting very precise amounts of chemical. The speed of the water motor and pump are proportional to the water flow, ensuring the Chemilizer™ will inject consistent amounts of chemical regardless of fluctuation in water pressure and flow.

This injector runs off of water flow and works with system flows as low as 1 gallon per hour up to 780 gallons per hour (13 gallons per minute). The HN55 will work with gravity via a water drop of as little as 5 feet (1.5 meters).

Applications: Disinfectants, sanitizers, fertilizers, micronutrients, biologicals, fungicides, algaecides, animal health supplements and medications, soaps, surfactants, and many other chemicals and solutions.

Selection is typically determined by the chemicals to be injected. Chemilizer™ HN55 Injectors with adjustable pump are also available. For help choosing the right injector to meet your needs, give one of our experts a call today — 1-800-433-6340.


  • No water filtration needed
  • Unique bypass chemical injection design
  • Excellent low flow capabilities
  • Flow Rate: 0.02-11 GPM
  • Pressure Rating: 3-85 PSI
  • Weight: 6.75 lbs
  • Size: 11" H x 8.5" W x 10" D
Item # Model Injection Ratio System Water Flow Operating Pressure Inlet / Outlet Weight
120177 HN55 1:128 1 GPH - 780 GPH 3-85 PSI 3/4" MGHT 6.75 lbs.
120177-1:100 HN55 1:100 1 GPH - 780 GPH 3-85 PSI 3/4" MGHT 6.75 lbs.
Brand Chemilizer
Manufacturer Part Number HN55



Manuals & Resources


Customer Reviews

  • 5 Stars


    Review by on Jan 6, 2017

    I have used chemistry products for several years and always have been simple to operate and most importantly dependable

  • 5 Stars

    Great Product

    Review by on Apr 15, 2016

    I've used Chemilizers for years to inject chlorine and soda ash into a small domestic water system that relies on a gravity fed spring far from a electric power supply. Pumps work 24/7. One word of caution - keep some spare bands on hand - they wear out or get thrown off if the pump is working at high strokes per minute.

  • 5 Stars

    Highly reccommended

    Review by on Feb 28, 2016

    Love these injectors! This is our 6th one; each time we build a new greenhouse we buy one of these. Simple construction; easy to get repair parts.

  • 5 Stars


    Review by on Jan 25, 2016

    All items seem great.

  • 5 Stars


    Review by on Apr 18, 2015


  • 4 Stars

    good unit

    Review by on Jan 15, 2015

    nice unit, directions leave something to be desired. First unit failed , I had to purchase a 2nd unit, returned the 1st for a full credit. good people to work with. 2nd unit working good, making Florida water much better. Does make a little noise.

  • 1 Stars

    Not impressed

    Review by on Jul 28, 2014

    Bought one a year ago,quit working so bought a rebuild kit to fix.Did not fix problem so I ordered another new one.Well,less then a month on new one and it has stopped working as well.No customer support to be found.Would not recommend this injector at all at this point

  • 5 Stars


    Review by on Jun 5, 2014

    It was easy to install and worked great supplying fertilizer through our drip tapes that run on low pressure and volume

  • 1 Stars

    Very Poor Quality Control

    Review by on May 28, 2014

    If I didn't have one that failed from last year I would of had to send it back. It was missing 2 of the retainer clips on the arm inside the unit. Would not recommend this product. The previous one failed with the housing cracking.

  • 4 Stars


    Review by on Apr 27, 2014

    It was delivered quickly, and easy to instal.

  • 5 Stars

    Best on the market

    Review by on Apr 11, 2014

    Bought this one to replace my Chemilizer chlorine injector that froze during a severe cold spell this past winter. Use the injector for the iron bacteria removal system in my household water. These pumps are the way to go, and this web site had the lowest price.

  • 5 Stars

    Big Improvement

    Review by on Mar 20, 2014

    So far so good. This injector seems to be far superior to our old one simply because the fertilizer stays completely outside the injector. I like the use of hoses to hook up the inflow and outflow---makes installation a breeze. Great product.

  • 5 Stars


    Review by on Dec 12, 2013

    great product for adding chemical at correct rate

  • 5 Stars

    Great Product

    Review by on Aug 26, 2013

    Great product and customer support!

  • 5 Stars

    Great product and service!

    Review by on Aug 15, 2013

    Out standing product worked first time I set it up. Service from QC Supply was great.

  • 4 Stars

    Good product

    Review by on Jul 22, 2013

    Works great!

  • 5 Stars

    Very good

    Review by on Mar 29, 2013

    Just installed this week. Using the pump for a peroxide injection system in my home. Easy install and the results are obvious. Keeping the concentration of the chemical right is the key. The "clack clack" of the pump in the basement is a good way of knowing it is working and like most house sounds it quickly becomes background.

  • 5 Stars


    Review by on Feb 19, 2013

    Nice pump.

  • 1 Stars

    NOT Reliable

    Review by on Nov 22, 2012

    My husband has been fighting with this thing for the last week; it broke down when he needed it most, resulting in dead birds. (A disease got in the barn and medication was required.) He fixed the broken part, to have it break the next day. Fixed it again, next day, broken. Now this morning, he comes in telling me it's broken again and his turkeys have been without their medicine all night. This thing has cost us probably hundreds of birds because it just won't work. So he tried to borrow his dad's, who is also a turkey farmer. However, his dad's was broken too. We just can't keep these things functional on the farm. NOT RELIABLE AT ALL.

  • 5 Stars

    great, very useful

    Review by on Jul 25, 2012

    I use the Chemilizer to fertilize my orchids through the garden hose. I started with one unit but have added a second in series to allow me to use two fertilizers at once. These are great as they allow me to save a lot of time fertilizing and are more efficient in the use of fertilizers.
    I plan to connect this to the automatic sprinkler system in Spring to feed the plants automatically.

    Just one tip, I recommend for those outside the USA to also purchase a set of hose fittings as the threads are different in Australia.

  • 5 Stars

    Totally trouble free.

    Review by on Jun 28, 2012

    This is our 3rd Chemilizer. We are a commercial greenhouse and have used other varieties of fertilizer injectors and we would eventually reach the point where we had to replace rings, pistons, etc., and then the problem was trying to figure out where to find replacement parts. We got our first Chemilizer about 7 years ago and have NEVER had one problem. That's why we now have 3.

  • 5 Stars


    Review by on Mar 31, 2012

    Very easy to install. Works great and is much less expensive than other injectiors.

  • 5 Stars

    Great product

    Review by on Mar 18, 2012

    We are using the pump for chlorine injection in water purification systems in the mountains of Honduras. The pump is part of a simple but sophisticated water purification system that uses no electricity to purify water for several communities ranging from 250 to 4000 people. The water is used for drinking, brushing teeth, cooking and taking care of infants. The chlorine adds "residual" disinfectant to water which is sold at very low cost in 5 gallon bottles.

  • 5 Stars

    the best pump around

    Review by on Nov 26, 2011

    This pump will blow your mind! i think this is the best easy pump on the market. when you get done using this pump just flush it with clean water and then when you need it again it will pump away. reliable pump. Do the smart thing...buy a chemilizer, your flock or heard or whatever needs one.....TODAY!

  • 5 Stars

    Good Product

    Review by on Aug 1, 2011

    Good product. Easy to install. Injects fertilizer properly.

  • 5 Stars

    Big bang for the buck!

    Review by on Apr 23, 2011

    While I cannot take away from any other injector, the HN55 is one little work horse that just don't know the meaning of quit.


  • 5 Stars


    Review by on Sep 1, 2010

    Very thrilled at the level of service. Things just don't happen that quick with other companies! Wow!

  • 5 Stars


    Review by on Aug 27, 2010

    The most rugged durable pump on the market. Keeps on working and working. Great!

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