Hydroponic Greenhouse Phosphate Test Strips

SKU: 33817-P

$16.95USD or lower Each

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Monitor phosphate levels in hydroponic and greenhouse nutrient solutions. Maintain balanced fertilizer ratios for healthier plant growth with Indigo® phosphate test strips.

Phosphate is an essential macronutrient for plant growth, supporting root development, flowering, and energy transfer, but excessive or imbalanced levels can lead to nutrient lockout, precipitation, or unwanted algae growth in hydroponic and greenhouse systems. Indigo® 0-100 ppm Phosphate Test Strips provide a fast, practical way to monitor phosphate concentrations in nutrient reservoirs and recirculating solutions. Simple dip-and-read testing helps growers verify fertilizer dosing and maintain balanced nutrient ratios without instruments or reagents.

We've been selling phosphate test strips since 2009. Buy fully documented Indigo® phosphate test strips, 50 strips/vial. Guaranteed 3 year shelf life (dated back from expiration date "yyyy.mm.dd").
Details Specs Docs Reviews
Details
Learning Outcomes / Key Features
Chemistry
  • Recognize phosphate (PO43-) as a key nutrient ion influencing pH and solubility equilibria.
  • Correlate nutrient solution chemistry with ppm concentration readings on test strips.
  • Explore precipitation reactions and nutrient availability in various hydroponic media.
Biology
  • Explain how phosphate supports plant metabolism, root development, and flowering.
  • Relate nutrient balance to plant health, deficiency symptoms, and productivity.
  • Discuss the role of phosphate alongside nitrate and potassium in overall plant nutrition.
Environmental Science
  • Examine sustainable fertilizer use and runoff control in greenhouse operations.
  • Evaluate water reuse strategies based on nutrient depletion or excess.
  • Promote closed-loop nutrient management and reduced environmental impact.
Agricultural / Horticultural Studies
  • Develop hands-on skills in solution testing and nutrient management.
  • Interpret phosphate test results to adjust feed schedules and dilution ratios.
  • Understand practical compliance with food safety and agricultural water standards.

Best Practices

  • Calibrate nutrient solution using manufacturer fertilizer charts.
  • Test fresh mixes and recirculating water weekly or after nutrient adjustments.
  • Record phosphate trends to anticipate plant uptake rates.
  • Pair with nitrate and pH test strips for comprehensive nutrient monitoring.
Related information or images
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Educational Experiments

Specifications

This Indigo® test strip indicates the presence of phosphate. Results for ranges shown below can be read in 30 seconds.

  • Phosphate is measured in increments of 10, 25, 50 & 100ppm
  • Phosphate strips have a detection limit of 5 ppm.
  • The number of strips (50) vial is approximate.
  • These strips have a guaranteed shelf of 3 years from date of manufacture (indicated by expiration date).
  • Reseal the desiccant lined bottle immediately after removing a strip to ensure 3 year shelf life.
  • Vial must be kept tightly sealed & kept at typical room temperatures.
Documentation

A Certificate of Conformance is available on request after shipment.
Indigo® phosphate test strips are made in USA & calibrated with NIST standards.

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Phosphate Test strips 0-100ppm Stability Statement Indigo Phosphate Test strips 0-100ppm CoA Indigo Phosphate Test strips 0-100ppm SDS
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