First, test your water. Seriously. Don’t guess. Buy a test kit or send a sample to a lab. You need to know the iron level, the pH, and if you have iron bacteria. This is 90% of the battle.
Low iron (under 5 ppm) and neutral pH? Get a Birm filter. High iron (over 10 ppm) and you’re okay with maintenance? Greensand. Iron bacteria or a mix of issues? Air injection is your hero.
Remember, your irrigation system is an investment. A $500 filter can save you $2,000 in damaged drip tape and dead plants. Don’t be cheap on the filter; be cheap on the therapy you’ll need if you ignore it.
Installation & Maintenance – The Unsexy Truth
Most of these filters need a backwash line. That’s a pipe that dumps the dirty water somewhere – a drain, a garden you don’t mind rusting, or a dry well. No backwash? No filter. Plan for it now.
Top 5 Iron Filters for Irrigation: Your Buying Guide
Also, check your flow rate. A filter that’s too small will choke your sprinklers. A filter that’s too big is just a waste of floor space. Match it to your system’s gallons per minute (GPM). Fist bump your inner geek.
Oh, and winterize it if you live in a freezing climate. A frozen filter is a sad, cracked filter. Trust me, I learned the hard way.
