Reverse Osmosis Chemicals
Unit B Badex Building
Westbrook Park
Old Trafford
Manchester M17 1AY
United Kingdom

t: +44 (0) 330 223 31 31

Automatic Silt Density Index (SDI) Test Kit Print E-mail

Automatic SDI Monitoring - Routine Silt Density Index (SDI) measurement can prevent membrane fouling and improve the efficiency of reverse osmosis (RO) systems. The manual SDI method can be tedious, time consuming and on occasion prone to errors. By automating the test, our ROC Auto SDI provides an accurate, easy way to perform routine SDI measurements.

accepta-auto-sdiOur Auto SDI test kit is compact, light weight and battery-powered. Additionally, our Auto SDI kits portability makes it ideal for trouble­shooting and routine monitoring of multiple RO systems.

Auto SDI features

  • Performs SDI 5, 10 and 15 minute tests with both 100ml and 500ml sample size tests – provides useful data that’s impossible to obtain with the manual method. Especially helpful on high SDI waters.
  • Unattended operation. Start the test and return in 15 minutes for the results – saves you time.
  • Real-time display of results including SDI, current flow rate and elapsed time. End of test display includes SDI 5,10 & 15 with 100 ml and 500 ml results.
  • More accurate than hand testing (ASTM D 4189-95) – consistent results provides better information.
  • Battery powered for true portability – conduct tests anywhere.
  • Uses standard 47 mm membrane filters – for lower consumable cost and worldwide availability.
  • Booster pump is an optional component of the standard kit.




Included in ROC Auto SDI kit:



Optional kit components:




Dimensions (mm)

  • Width - 273
  • Depth - 248
  • Height - 127

Weight (kg)

  • 3.2 kg


  • Battery: 6V 1.3 AH SLA type. 13 hours testing/charge.
  • Power Supply: 110VAC-9VDC 500ma or 220VAC-9VDC 500ma


  • Pressure: 35-100 psi
  • Temperature: 35-100°F
  • Solids: Free of solids. Filter to 50 microns minimum.
  • Inlet: 1/4” OD tubing.




Technical support and advice

Reverse Osmosis Chemicals International work closely with a diverse range of global organisations, intelligently combining advanced treatment technologies with practical solutions to resolve complex issues. If you have a project you would like to discuss, or you require technical support and assistance; or if you simply have a question about our Silt Density Index analysis equipment please contact one of our specialist advisors using our Technical Support page or call us on +44 (0) 330 223 31 31.