Drip Clogging & Catch the Hazard Before It Blocks
Scores iron
Drip emitters meter water through passages a fraction of a millimetre wide, so they clog fast — score your water on iron, manganese, pH and bacteria to get a low, moderate or high hazard band and the treatment it needs.
Enter your water quality
Next: standard practice is enough — flush laterals periodically and use a 120-mesh screen/disc filter; recheck water quality each season.
Score sums points for iron, manganese, pH and bacterial load; ≤2 low, ≤5 moderate, >5 high (max 8).
Drip clogging — key facts
- Score range
- 0–8 (four factors × 0–2)
- Low risk
- score 0–2
- Moderate risk
- score 3–5
- High risk
- score 6–8
- Iron flag
- >0.1 ppm = 1, >1.5 ppm = 2
- pH flag
- 7–8 = 1, >8 = 2
- Bacteria flag
- >10k = 1, >50k cfu/ml = 2
- Privacy
- Runs in your browser; nothing uploaded
Clogging is the number-one killer of drip systems
A drip emitter waters a plant by forcing flow through a maze of tiny channels, and anything that can settle, precipitate or grow will eventually block them. The three clogging types — physical (sand, silt), chemical (iron, manganese, lime) and biological (bacterial slime, algae) — often combine, and a partly clogged line is invisible until the crop shows stress. Screening the water first is far cheaper than replacing laterals.
This tool turns four standard water-quality factors — iron, manganese, pH and bacterial population — into a single hazard score out of 8 and a low, moderate or high band. Use it to decide what treatment to plan: oxidation and filtration for iron and manganese, acid injection for high pH, and chlorination for bacteria. Pair it with the Drip Chlorination, Drip Flushing and Drip Filter Sizing tools for a full water-treatment plan.
Screen before you build
Catch clogging hazard at the design stage, not after.
Target the treatment
See whether iron, pH or bacteria is the real driver.
Protect the investment
Avoid the cost of replacing blocked laterals.
Plan maintenance
Set flushing and chlorination to match the risk.
Frequently Asked Questions
How is the drip clogging risk scored?+
The tool adds points from four water-quality factors: iron, manganese, pH and bacterial population. Each factor scores 0, 1 or 2 — for example iron above 1.5 ppm scores 2, between 0.1 and 1.5 ppm scores 1, and below 0.1 ppm scores 0. The four scores sum to a total out of 8; 0–2 is low risk, 3–5 is moderate and 6–8 is high. The band tells you how aggressively the water must be treated before it reaches the emitters.
Why do drip emitters clog so easily?+
Drip emitters meter water through tiny passages a fraction of a millimetre wide, so even small amounts of precipitate, slime or grit can block them. Clogging is physical (sand, silt), chemical (iron and manganese oxides, lime scale) and biological (bacterial slime and algae). Because a blocked emitter waters nothing and you often cannot see it, clogging is the single biggest cause of drip systems failing — which is why screening the water first matters.
What iron level is a problem for drip?+
Iron above about 0.1 ppm starts to risk clogging because dissolved ferrous iron oxidises to insoluble rust that coats emitters and feeds iron bacteria; above roughly 1.5 ppm the hazard is severe. The tool scores iron 1 point from 0.1 ppm and 2 points above 1.5 ppm. High-iron water usually needs aeration, settling, oxidation-filtration or chlorination ahead of the filter.
Why does pH matter for clogging?+
High pH water (above about 8) lets calcium and magnesium precipitate as scale and helps iron and manganese drop out of solution, both of which plug emitters. The tool scores pH of 7–8 as 1 point and above 8 as 2 points. Acidifying the water — injecting a mild acid to hold pH near 6.5–7 — keeps these minerals dissolved and is a standard high-pH treatment.
How does bacterial population cause clogging?+
Bacteria — especially iron and sulphur bacteria — grow into a slime that traps sediment and blocks emitters from the inside; this biological clogging is often the hardest to clear. The tool scores a population above 10,000 cfu/ml as 1 point and above 50,000 as 2 points. Shock or continuous chlorination, keeping lines dark, and regular flushing control the slime.
What does a 'high' risk band mean I should do?+
A high band (6–8) means the water will clog emitters quickly without treatment, so combine measures: good filtration, oxidation or aeration for iron and manganese, acid injection for high pH, and chlorination for bacteria, plus frequent line flushing. A moderate band means one or two targeted treatments; a low band means basic filtration and routine flushing are usually enough.
Does the score replace lab testing or filtration?+
No — it is a fast screening guide built from a standard four-factor water-quality scheme, not a substitute for a proper lab analysis. Use it to decide whether to test further and what treatment to plan, but always size filtration to the physical load and confirm iron, manganese, pH and bacteria with a laboratory before designing the head works.
How often should I act on the risk?+
Re-check water quality at least each season, and more often if your source is a shallow well, pond or canal where iron and bacteria swing with the water table and temperature. Even low-risk systems should be flushed regularly and chlorinated periodically; moderate and high-risk systems need a written maintenance schedule so the treatment keeps pace with the hazard the score reveals.