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Aster SDI Test Kit – Silt Density Index Kit

Aster SDI Test Kit – Silt Density Index Kit

Rs. 5,799.00
Rs. 8,409.00 Rs. 5,799.00
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The Aster SDI Test Kit is a simple and effective testing device used to determine the Silt Density Index (SDI) of feed water before it enters a reverse osmosis (RO) system. Fine suspended and colloidal particles in feed water can accumulate on RO membranes and contribute to membrane fouling.

The kit provides a convenient way to evaluate feed-water fouling potential by measuring the change in filtration time through a 47 mm, 0.45-micron filter paper. It is particularly useful for checking water quality at different points in a pretreatment system and helping operators assess the condition of water going to RO membranes.

 

🫗 Quick Highlights

  • Designed for Silt Density Index (SDI) testing
  • Helps assess the fouling potential of RO feed water
  • Integral stainless-steel needle valve for pressure control
  • Quick-release coupling for convenient multipoint sampling
  • Built-in pressure gauge for monitoring test pressure
  • Automatic air release valve
  • Transparent polycarbonate body for easy observation
  • Includes 500 ml sampling beaker
  • Uses standard 47 mm, 0.45-micron filter paper
  • Compact and convenient for RO plant operation and maintenance
  • Silt Density Index (SDI) Testing
  • Stainless-steel Needle Valve
  • Standard 47 mm, 0.45-micron filter paper
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💧 Key Benefits

  • Helps protect RO membranes: Identify potential fouling conditions before water reaches the membrane system.
  • Simple testing procedure: SDI testing can be performed using a straightforward filtration-time measurement.
  • Convenient multipoint testing: Quick-release coupling makes it easy to test water at different sampling locations.
  • Controlled test pressure: Integrated needle valve and pressure gauge help maintain the required test pressure.
  • Easy visual monitoring: The transparent body allows the filtration process to be observed.
  • Useful for pretreatment monitoring: Helps evaluate whether existing pretreatment is adequately controlling fine particulate and colloidal matter.
  • Compact and reusable: Designed for routine testing and maintenance applications.

📌 Technical Properties

  • Product: Aster SDI Test Kit / Silt Density Index Kit
  • Model: SDI-KIT
  • Material: Polycarbonate / ABS
  • Sealing: Silicon O-rings
  • Filter Paper: 47 mm diameter, 0.45 micron
  • Filtration Area: 12.5 cm²
  • Housing Capacity: 250 ml
  • Sampling Beaker Capacity: 500 ml
  • Pressure Gauge Range: 0–4.2 kg/cm²
  • Operating/Test Pressure: 2.0 kg/cm² operating pressure; 3.0 kg/cm² test pressure
  • Inlet Connection: 1/4" female threaded needle valve
  • Pressure Gauge Connection: 1/4" female
  • Pressure Control: Integral SS needle valve
  • Air Management: Automatic air release valve
  • Connection Type: Quick-release coupling

📦 In-the-box

  • SDI Kit body
  • 1/4" SS needle valve
  • Quick-release elbow
  • Quick-release socket
  • Rubber grommets and O-rings
  • Top cover
  • 1/4" BSPF threaded adaptor
  • Pressure gauge
  • Air release cone and cap
  • 0.45-micron cellulose filter paper
  • Filter support disc
  • Disc holder
  • 500 ml sampling beaker

🌊 Applications

  • RO feed-water testing
  • RO membrane fouling assessment
  • Water treatment plants
  • Pretreatment performance monitoring
  • Micron filter performance checks
  • Surface and groundwater treatment systems
  • Industrial water treatment
  • Routine RO plant operation and maintenance
  • Multipoint water-quality monitoring

🛡️ Safety & Handling

  • Store reagents in a cool, dry place at ambient temperature
  • Keep bottles tightly closed after use
  • Use only provided reagents for accurate results
  • Avoid contamination of reagents

❓ How To Use

  1. Connect the SDI kit between the micron filter and high-pressure pump.
  2. Run the plant at service flow using the raw-water pump only.
  3. Close the SDI kit's needle valve completely.
  4. Adjust the membrane reject valve to obtain approximately 2 kg/cm² pressure.
  5. Place the 0.45-micron filter paper correctly inside the SDI kit.
  6. Open the SDI kit needle valve.
  7. Fine-adjust the membrane reject valve to maintain 2 kg/cm² on the SDI kit pressure gauge.
  8. Place the 500 ml beaker under the outlet.
  9. Record the time required to fill the empty 500 ml beaker as T₀.
  10. Allow water to continue passing through the same filter paper for 15 minutes.
  11. After 15 minutes, place the empty beaker under the outlet again and record the time required to collect 500 ml as T₁₅.
  12. Calculate the SDI using the formula below.

SDI Calculation

SDI = [1 − (T₀ / T₁₅)] × 100 / 15

Where:

  • T₀ = Initial time required to collect 500 ml
  • T₁₅ = Time required to collect 500 ml after 15 minutes

A higher SDI indicates a greater increase in filtration resistance during the test, indicating a higher presence of filterable suspended/colloidal material in the tested water.

Installation

  1. Provide a 1/4" BSPM threaded nozzle at the location where SDI measurement is required.
  2. Screw the SDI kit's needle valve onto the nozzle.
  3. Connect the kit using the quick-release coupling.
  4. The installation is then ready for testing.
  5. After testing, disconnect the kit and store it safely.

Filter Paper Handling

Handle the filter paper carefully and hold it only by the edges. Particles, fingerprints, or wrinkles on the filter paper can affect the test and result in an erroneous reading.

⚙️ How It Works

The SDI test measures how the filtration time changes over a 15-minute period when water is passed through a 0.45-micron filter at a controlled pressure.

First, the time required to collect 500 ml of water is recorded as T₀. The same filter is then used continuously for 15 minutes. After 15 minutes, the time required to collect another 500 ml is recorded as T₁₅.

As particles accumulate on the filter, the flow rate decreases and the time required to collect 500 ml increases. These two readings are used to calculate the SDI value.

🧪 Calibration & Usage

  • Maintain the recommended 2 kg/cm² operating pressure during the SDI test.
  • Do not exceed the specified test pressure of 3.0 kg/cm².
  • Handle filter paper carefully and avoid touching its filtration surface.
  • Ensure O-rings and seals are properly positioned before testing.
  • Check connections for leakage before starting the test.
  • Keep the kit clean after use.
  • Disconnect and store the kit safely after testing.
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FREQUENTLY ASKED QUESTIONS

Do you provide installation services?

Yes. We install RO plants, softeners, iron removal filters, ETP/STP systems, and all types of domestic & industrial water treatment plants across India.

Do you offer GST invoices?

Yes. Every order comes with a100% GST-compliant invoice, suitable for dealers, resellers, and industrial use.

How do I know which chemical or filter is suitable for my water?

You can share your raw water report, TDS, or problem description. Our technical team will recommend the correct chemical, membrane, filter media, or system.

Please connect with us from Contact Us.

Can I speak to someone before placing an order?

Yes, you can contact us directly via phone, email, or WhatsApp for product guidance or bulk pricing.

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