Short answer: In a dosing pump maintenance service, the foot filter, check valves, head and diaphragm area, hoses and connections are checked; sodium hypochlorite crystals are cleaned off, worn parts are replaced and the pump’s actual flow rate is measured. On measurement-controlled models, the electrode or sensor is cleaned and calibrated, and the level and flow alarms are tested. The maintenance interval depends on how the pump is used and on the chemical; there is no fixed interval that applies to every installation.
Periodic maintenance means checking the pump before it develops a fault. When a chlorine dosing pump runs on sodium hypochlorite, crystal build-up and part wear are inevitable; regular maintenance catches these effects before dosing drops. This page describes the maintenance work covered by our chlorine dosing pump service. For checks you can do yourself between maintenance visits, see our chlorine dosing pump maintenance guide.
What Is Checked During Periodic Maintenance?
During maintenance, all wetted parts, the electrical and signal connections and any measurement equipment are checked one by one.
| Check point | What is checked | If a problem is found |
|---|---|---|
| Foot filter | Sediment, clogging, cracks | Rinse with clean water; replace the suction assembly if damaged |
| Suction and discharge check valves | Crystals, sticking and wear on the balls and seats | Rinse; replace the check valve set if this does not help |
| Crystallisation | Around the head, hose ends, injection point | Dissolve the crystals with clean water and clear any blocked connection |
| Head and diaphragm area | Leaks around the head, tightness of the head screws, unexplained loss of flow | Replace the head assembly or diaphragm |
| Hoses | Hardening, discolouration, cracks, crushing at the ends | Replace the hose kit |
| O-rings and fittings | Dripping, swelling, hardening | Replace the seal or fitting |
| pH / ORP electrode | Fouling, slow response, drift from calibration | Clean, calibrate with buffer solution, replace if necessary |
| Free chlorine sensor | Flow, fouling, difference from the reference measurement | Clean and calibrate against a DPD measurement |
| Electrode housing filter | Clogging, sediment | Clean the washable filter |
| Level sensor | Free movement of the sensor, alarm activation | Clean, test the alarm, replace the suction assembly with level sensor if necessary |
| Electrical and signal | Cable, plug, earthing; water meter and flow signals | Correct the connection |
| Flow rate | Measurement of the pump’s actual flow rate | Adjust the setting or carry out capacity calibration |
The first maintenance task is cleaning off crystals. As sodium hypochlorite dries it leaves salt crystals; these prevent the check valve balls from seating properly, so the pump delivers less even though it is stroking. In AnTech electromagnetic pumps the diaphragm is PTFE and the balls are zirconia; these materials resist wear but do not prevent crystal build-up. On low-flow pumps with a small volume per stroke, such as the AnTech Lara A 2 L/h 10 Bar Analogue Dosing Pump, which delivers 0.278 ml per stroke, even a small deposit can noticeably affect the flow rate.
Hose and connection sizes vary with capacity. The AnTech Nova D 25 L/h 5 Bar Digital Dosing Pump uses 9×12 mm hose on the suction and discharge sides, while the 3.5 and 10 L/h models in the series use 4×6 mm suction and 4×7 mm discharge hose. Parts replaced during maintenance are chosen to match these sizes.
Why Is Maintenance More Detailed on Measurement-Controlled Pumps?
On measurement-controlled pumps, dosing follows the measurement, so even a small deviation in the electrode or sensor translates directly into incorrect dosing. On the AnTech Lara PR 5 L/h 7 Bar pH/ORP Controlled Dosing Pump or the Nova DMPR, the pH/ORP electrode is cleaned and calibrated with buffer solutions; on the Nova DMİA, the free chlorine sensor is compared with a reference measurement made with the DPD method. On electrode sets with a housing, the housing’s washable filter is also cleaned. The list of series and models is in the pH / ORP controlled dosing pumps category.
How calibration is carried out is explained in detail on our AnTech dosing pump calibration page.
What Determines the Maintenance Interval?
The maintenance interval is set according to how the pump is used and the chemical; there is no single interval that applies to every installation. The following factors shorten or lengthen the interval.
- Type and concentration of the chemical: Sodium hypochlorite leaves crystals and releases gas as it decomposes. Pumps running on concentrated solutions may need more frequent checks.
- Running time and stroke count: The moving parts of a pump that runs at a high setting for most of the day wear faster.
- Downtime: On a pump that has not run for a long time, chemical left in the head and hoses can dry and leave crystals.
- Temperature: The catalogue limits are 0–45 °C for the environment and 0–40 °C for the chemical. A hot environment speeds up the decomposition of hypochlorite.
- Water quality: In measurement-controlled systems, water containing sediment or lime fouls the electrode and housing filter more quickly.
- Measurement and automation: Systems with electrodes, sensors, and level and flow alarms have more points to check.
- Previous maintenance records: The condition of the parts at the last maintenance visit is the most reliable guide to when the next one is due.
At the first maintenance visit, a suitable interval for your installation is agreed by looking at the condition of the parts. If you would like to schedule regular maintenance, write to us and we will assess your installation’s conditions together.
What Should Be Recorded in the Maintenance Log?
After each maintenance visit, we recommend noting the pump’s condition and the work carried out in a logbook or spreadsheet; this record becomes the point of comparison for the next visit.
- The pump model and where it is installed.
- The parts checked and the condition of each.
- The parts cleaned and replaced.
- The flow rate measured before and after maintenance.
- On measurement-controlled models, the buffer solution readings and the calibration result.
- The test results of the level, flow and measurement alarms.
- Risks observed and recommendations for the next visit.
Keeping this record makes it easier to see which part was replaced and when if a problem recurs. If a part needs replacing during maintenance, it is selected using the compatibility table on our dosing pump part replacement page.
How to Request Maintenance
To request maintenance, simply send us the pump model, the chemical you use and the date of the last maintenance. You can send your request through the form on our contact page, call +9+90 216 606 44 72 or message +9+90 532 542 81 24 on WhatsApp; we will get in touch with you.
Including the following in your request makes it easier to plan the maintenance: a photo of the pump’s label, its daily running time, any recent changes you have noticed (drop in flow, leaks, alarms) and, on measurement-controlled models, the date of the last calibration. If the pump is currently faulty, start with our dosing pump repair page instead of maintenance. For details by series, see the AnTech Lara and AnTech Nova series pages.
Sources
- AnTech 2025 Product Catalogue (KT_25 R02): feature lists and operating temperatures for the electromagnetic series, electrode sets and electrode housing filters.
Frequently Asked Questions
How often should maintenance be carried out?
There is no fixed interval. It depends on the type and concentration of the chemical, the pump's daily running time, the ambient temperature and whether measurement equipment is fitted. At the first maintenance visit, we look at the condition of the parts and agree on a suitable interval with you.
Which parts are replaced during periodic maintenance?
Only parts that are worn or cannot be restored by cleaning are replaced. The parts replaced most often are hoses, check valve sets, and suction and discharge assemblies; the head assembly and diaphragm are replaced if there is a leak or an unexplained loss of flow.
Can I do the maintenance myself?
You can do basic tasks such as checking the foot filter and hoses, cleaning off crystals and monitoring the tank level yourself; the steps are described in our maintenance guide. For check valve and head replacement, capacity calibration and electrode calibration, write to us.
Is maintenance different on measurement-controlled pumps?
Yes. In addition to the mechanical checks on the pump, the pH/ORP electrode or free chlorine sensor is cleaned and calibrated, the housing filter is rinsed and the measurement alarms are tested. Because any drift in the sensor translates directly into incorrect dosing, these steps are not skipped.
What information should I give in a maintenance request?
Send a photo of the pump's label, the chemical you use, the date of the last maintenance and any recent changes you have noticed. On measurement-controlled models, also include the electrode or sensor you use and the date of the last calibration.