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Desludge Frequency Table

DESLUDGE FREQUENCY TABLE

Need help with Septic Tank emptying and desludging?

Our handy guide on the recommended frequency for servicing and desludging for sewage
treatment plants, for all main manufacturers. Although some manufacturers do offer longer
desludge timescales we recommend at least an annual desludge and service to ensure that
your system continues to run without issue.

If your system is not listed and you do not have a manual, British Water recommend a desludge frequency of no less than 6 months for domestic customers and 3 months for commercial.

The following table is all dependent on usage and systems used less frequently may require more frequent desludging.

Treatment Plant Service Frequency Desludging Frequency
KLARGESTER
BA GRAVITY 12 months 12 months
BA PUMP 12 months 12 months
BA X GRAVITY 12 months 12 months
BA X PUMP 12 months 12 months
BB GRAVITY 12 months 6 months
BB PUMP 12 months 6 months
BC GRAVITY 12 months 6 months
BC + Twin EFF PUMP STN 12 months 6 months
BD GRAVITY 6 months 6 months
BD + Twin EFF PUMP STN 6 months 6 months
BE GRAVITY 6 months 4 months
BE+ Twin EFF PUMP STN 6 months 4 months
BF GRAVITY 6 months 4 months
BF+ EFF PUMP STN 6 months 4 months
BG GRAVITY 6 months 4 months
BG+ Twin EFF PUMP STN 6 months 4 months
BH GRAVITY 3 months 5/ 6 months re usage
BH+ Twin EFF PUMP STN 3 months 5/ 6 months re usage
BJ GRAVITY 3 months 4/ 5 months re usage
BJ+ Twin EFF PUMP STATION 3 months 4/ 5 months re usage
BK GRAVITY 3 months 3 months
BK+ Twin EFF PUMP STATION 3 months 3 months
BL GRAVITY 3 months 3 months
BL+ Twin EFF PUMP STATION 3 months 3 months
AF1 / P6 GRAVITY 12 months 12 months
AF1 / P6 PUMP 12 months 12 months
AF2 / P12 GRAVITY 12 months 6 months
AF2 / P12 PUMP 12 months 6 months
AF3 / P18 GRAVITY 12 months 6 months
AF3 / P18 PUMP 12 months 6 months
AF4 / P25 GRAVITY 6 months 6 months
AF4 / P25+ Twin EFF PUMP STN 6 months 6 months
AF5 / P40 GRAVITY 3/ 6 months re usage 3 months re usage
AF5 / P40 + Twin EFF PUMP STN 3/ 6 months re usage 3 months re usage
AF6 / P55 GRAVITY 3/ 6 months re usage 3 months re usage
AF6 / P55 + Twin EFF PUMP STN 3/ 6 months re usage 3 months re usage
AF7 / P75 GRAVITY 3/ 6 months re usage 3 months re usage
AF7 / P75 + Twin EFF PUMP STN 3/ 6 months re usage 3 months re usage
AF8 / P100 GRAVITY 3 months 3 months re usage
AF8 / P100 + Twin EFF PUMP STN 3 months 3 months re usage
AF9 / P125 GRAVITY 3 months 3 months re usage
AF9 / P125 + Twin EFF PUMP STN 3 months 3 months re usage
AF10 / P150 GRAVITY 3 months 3 months re usage
AF10 / P150 + Twin EFF PUMP STN 3 months 3 months re usage
AF11 / P200 GRAVITY 3 months 3 months re usage
AF11 / P200 + Twin EFF PUMP STN 3 months 3 months re usage
AF12 / P250 GRAVITY 3 months 3 months re usage
AF12 / P250 + Twin EFF PUMP STN 3 months 3 months re usage
AF13 / P300 GRAVITY 3 months 3 months re usage
AF13 / P300+ EFF PUMP STATION 3 months 3 months re usage
AF14 / P375 GRAVITY 3 months 3 months re usage
AF14 / P375 + EFF PUMP STATION 3 months 3 months re usage
Balmoral
CAP 6 Gravity 12 months 12 months
CAP 6 Pump 12 months 12 months
CAP 12 Gravity 12 months 6 months
CAP 12 Pump 12 months 6 months
WPL
Diamond DMS2 Gravity 6 months up to 3 yrs re usage
Diamond DMS2 Pump 6 months up to 3 yrs re usage
Diamond DMS3 Gravity 6 months up to 3 yrs re usage
Diamond DMS3 Pump 6 months up to 3 yrs re usage
Diamond DMS4 Gravity 6 months up to 3 yrs re usage
Diamond DMS4 Pump 6 months up to 3 yrs re usage
Diamond DMS5 Gravity 6 months up to 3 yrs re usage
Diamond DMS5 Pump 6 months up to 3 yrs re usage
PremierTech Aqua
Solido 35 12 months 12 months
Solido 45 12 months 12 months
Solido 60 12 months 12 months
Solido 3535 12 months 12 months
Solido 4545  6 months re usage  6 months re usage
Solido 6060  6 months re usage  6 months re usage
Pump Stations
Single Crude / Effluent Pump Station 6 months 12 months
Twin Crude / Effluent Pump Station 6 months 12 months
Note prices are for labour only and exclude parts
Note: AF5/P40, AF6/P55, AF7/P75 etc – either 3 or 6 months re site conditions
i.e. Caravan park maybe 3 months.

You can find more information in the British Water guide to desludging of sewage treatment systems

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