COVID19 Update:

Hydro Instruments has remained operational as a life-sustaining business.  We continue to accept and ship orders and assist customers with their needs.  However, we are operating with minimal personnel on site in compliance with the social distancing and other mitigation measures to protect employees and the public.

As of March 23rd, office staff, including sales and service, are working remotely.

For assistance, we ask that you please email  A sales or customer support representative will then reach out to you.  Thank you.


Hydro Instruments manufactures the world's highest quality gas chlorinators, gas chlorination systems, gas feed systems and chemical metering equipment.


Hydro gas chlorinators & residual chlorine analyzers have become globally recognized as the most ruggedly designed, highest quality and longest lasting available. If you have been using another brand of gas chlorinator, spend a few minutes finding out why Hydro is the fastest growing gas chlorination equipment manufacturer in the market.


Our product line includes: chlorine gas feeders, residual chlorine analyzers and chlorination equipment, ejectors, dechlorination systems, calibration columns and corporation stops for chemical injection.  Download the Hydro Instruments product line overview here.

Hydro Instruments also manufactures corporation stops in a variety of sizes and materials.

All Hydro Instruments                 ISO 9001 & 14001                                     

           products are made in the USA.         CERTIFIED                CE MARK