Antiscalants, oxidizing biocides, and acids — HEDP, peracetic acid, and phosphoric acid — for keeping drip irrigation, fertigation, and greenhouse recirculating lines free of scale, biofilm, and pH-driven plugging.
Irrigation water treatment chemicals keep drip emitters, fertigation lines, and recirculating greenhouse systems flowing by controlling three problems: mineral scale, biological fouling, and the wrong pH. The core toolkit is a phosphonate antiscalant (HEDP) that holds calcium and iron in solution, an oxidizing biocide such as peracetic acid for biofilm and algae, and an acid such as phosphoric acid to lower water pH for emitter cleaning and nutrient solubility. Most systems need all three because each addresses a failure mode the others do not.
HEDP is a threshold antiscalant. Dosed at a few parts per million it disrupts calcium carbonate crystal growth rather than sequestering the full hardness load, which is why it works far below stoichiometric levels. The trade-off is real: phosphonates add phosphorus to the water, and phosphorus can feed the same algae a biocide is meant to suppress. Match the antiscalant dose to measured hardness, start near 2-5 ppm, and adjust against scale monitoring rather than overdosing.
Peracetic acid decomposes to acetic acid, oxygen, and water, so it leaves no persistent chlorinated residue in the line. It is a strong oxidizer and a corrosive concentrate, so handle it per its SDS and confirm material compatibility with your emitters, filters, and injection equipment before use. Phosphoric acid both lowers pH and contributes phosphate nutrient, which makes it a common pick for fertigation where acid duty and feeding overlap.
We use cookies and similar technologies for analytics and to improve our Site, and — with your consent — for marketing and B2B visitor identification. Choose what to allow. See our Privacy Policy.