Technical boundary: This resource is a buyer-planning framework. It is not an ISO, ASTM, or laboratory procedure; not a certificate or current-lot result; and not a substitute for qualified laboratory, statistical, agronomic, contractual, customs, or destination advice.
An EC or pH number is not fully comparable until the buyer identifies how the sample was conditioned, how water and material were combined, how the extract was obtained, which meter and units were used, and which tolerance and retest rule control the decision. UMass Extension describes saturated media extract, 1:2 dilution, and PourThru as different approaches that can produce different numbers. For an unopened commercial cocopeat block, the buyer and laboratory should agree a suitable incoming-material method rather than silently comparing results from different procedures.
Write the method before writing the acceptance number
A technical specification should name the material condition, extraction procedure, water quality, mass or volume basis, contact time, agitation, filtration or settling step, measurement temperature, meter calibration, reporting unit, replicate rule, and rounding convention. It should also say whether a result applies to one block, a composite sample, a test unit, or the lot decision. This prevents a familiar dispute: supplier, buyer, and laboratory each report a defensible value, but the values came from different preparation routes.
Define the specimen
Identify unopened block, hydrated coir, production substrate, or container leachate. These are not interchangeable test objects.
Fix the extraction
Name the agreed ratio or recognized procedure, water specification, conditioning, contact time, agitation, separation, and measurement timing.
Control the meter
Record calibration standards, temperature compensation policy, probe condition, unit, resolution, replicate handling, and operator or laboratory.
Connect the decision
State target or limit, tolerance, rounding, sample basis, retest trigger, retained sample, and authority to accept, hold, or reject the lot.
Fields the buyer should put in writing
The table is designed to expose missing decisions before a sample or shipment creates urgency. Adapt it to the actual product, laboratory, destination, test risk, and contract; delete an item only after the responsible parties agree that it does not apply.
| Control point | What the written plan should define |
|---|---|
| Saturated media extract (SME) | A laboratory-oriented water extraction for soilless media. If selected, name the laboratory procedure and do not compare its interpretation range directly with another extraction method. |
| 1:2 dilution | A defined material-to-water volume ratio described by UMass for occasional on-site testing. State drying or conditioning, water, mixing, separation, and timing. |
| PourThru or leachate | Designed for container-crop monitoring under a controlled irrigation protocol. It is not automatically an incoming test for a dry compressed block. |
| Direct slurry or house method | Accept only when the complete procedure is attached to the order and both parties know how its values relate to the stated limits. |
| Laboratory method code | Ask the laboratory to place the method identifier, sample identity, receipt condition, preparation, units, result, and any deviation on the report. |
| Cross-laboratory comparison | Use split material, the same written method, appropriate replicates, calibration records, and an agreed approach to measurement uncertainty or disputed results. |
A controlled comparison from block to reported result
The sequence below is a procurement framework, not a substitute for a qualified laboratory procedure. Its purpose is to keep the specimen identity and agreed method intact from sampling through the commercial decision.
- Lock the specification revision — Attach the EC and pH method, limits, tolerances, sample basis, reporting format, and retest rule to the quotation or purchase document.
- Identify and condition samples — Preserve lot, pallet, block, date, seal, and custody information; use the specified conditioning and water without unrecorded substitution.
- Measure and record deviations — Calibrate as required, run the agreed replicates, retain raw readings, and state any departure from the procedure before interpreting the result.
- Apply the decision rule — Compare the correctly rounded result with the written criterion, then release, hold, retest, investigate, or reject only through the agreed authority.
What a useful EC and pH report should preserve
A buyer-useful report identifies the sample and lot, condition on receipt, method and revision, extraction ratio or route, water used, dates, instrument or laboratory, units, individual readings where required, calculated result, rounding, deviations, and sign-off. A certificate that presents only “EC: 0.5” without unit, method, specimen basis, or sample identity cannot by itself demonstrate order conformity. Keep the report connected to the retained sample and purchase specification so a later investigation can reconstruct the decision.
How the two active 5kg grades enter this control
| Active grade | Buyer-control boundary |
|---|---|
| 5kg block — Low EC | The site publishes a low-EC reference below 0.6 mS/cm, pH 5–7, and moisture 10–20%. The order must still confirm the method, tolerance, sample basis, and evidence; the webpage is not a batch certificate. |
| 5kg block — High EC | The site publishes a high-EC reference above 0.7 mS/cm. That label does not define a universal extraction procedure or application suitability, and it must not be compared with a differently prepared result. |
Before a purchase is released, also review the application guides, document and analysis guide, MOQ and shipping terms, and the importer’s current destination requirements.
Independent technical references
These institutional sources support the measurement or procurement context. They do not inspect Coco Export Indo, verify either active grade, or certify a commercial lot.
- UMass Extension — Methods of Greenhouse Media Testing and How They DifferExplains why extraction method matters and distinguishes SME, 1:2 dilution, and PourThru testing.
- NC State Extension — The Pour-Through Extraction ProcedureDocuments a controlled leachate procedure for nursery crop monitoring and the importance of consistent timing and handling.
Frequently asked questions
Can two EC results be compared when both use mS/cm?
Not safely on the unit alone. Sample condition, extraction method, water, ratio, timing, temperature, and calculation can change the reported value.
Should PourThru be used to accept dry cocopeat blocks?
PourThru is presented by extension sources for monitoring planted containers. An incoming compressed-block method should be agreed separately with the responsible buyer and laboratory.
What happens when supplier and buyer results differ?
Follow the written split-sample, retained-sample, retest, third-party laboratory, and disposition rule. Do not switch methods after seeing an unfavorable result.
Does the published product EC act as a certificate?
No. It is a product-sheet reference. Lot-specific conformity requires the method, sample identity, evidence, tolerance, and final written order criteria.
Continue the technical buyer review
Send a more decision-ready enquiry
Identify the grade, intended use, current specification revision, methods and limits, lot and sampling plan, evidence, packing, quantity, destination, and target timing. Mark unresolved fields for written clarification instead of allowing an assumption to become an acceptance criterion.