Silt Density Index (SDI) Kit Silt Density Index (SDI) KitSDI measurement is one of the best methods for monitoring the performance of pretreatment equipment relative to the potential for downstream membrane fouling.
The rate at which 500 mL of water passes through a 0.45 micron filter at a pressure differential of 30 psi is measured initially and after a time interval of 5, 10, or 15 minutes. The SDI index is calculated as the ratio of these measured times subtracted from one, multiplied by 100 and divided by the total time of the test in minutes.
Because the 0.45 micron filter is tight enough to remove bacteria and most of their byproducts, the SDI test results tend to better correlate with the performance of a membrane system than turbidity and other non-membrane based analyses.
Download SDI procedures as a pdf file: CEA_SDI_Procedures
| SDI Kit Components 47 mm filter holder with air relief valve 47 mm 0.45 micron nitrocellulose filters (pack of 100) Plastic pressure regulator 0-60 psig, 2 1/2" pressure gauge 500 mL graduated cylinder (larger than shown) Tweezers Stopwatch Calculator Isolation valve Misc. tubing, pipe, & fittings Padded carrying case Instructions for use Note: SDI device is pre-assembled as shown. |
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SDI Kit: $595.00 (includes 100 filters) plus shipping and sales tax (if within Minnesota)
New! - Improved regulator and pressure gauge
Order the manual SDI Kit now by credit card by clicking the appropriate option below, or call CEA at 952-471-0017, or fax/mail your ordering information to CEA (Fax: 952-471-9261).
