diff --git a/docs/output_fields.rst b/docs/output_fields.rst
index 9943774..f469125 100644
--- a/docs/output_fields.rst
+++ b/docs/output_fields.rst
@@ -214,7 +214,7 @@ Groundwater screens (grondwaterfilters)
     y,1,float,194090
     start_grondwaterlocatie_mtaw,1,float,NaN
     gemeente,1,string,Destelbergen
-    meetnet_code,10,integer,1
+    meetnet_code,10,string,1
     aquifer_code,10,string,0100
     grondwaterlichaam_code,10,string,CVS_0160_GWL_1
     regime,10,string,freatisch
diff --git a/pydov/types/grondwaterfilter.py b/pydov/types/grondwaterfilter.py
index 5378743..4c25b43 100644
--- a/pydov/types/grondwaterfilter.py
+++ b/pydov/types/grondwaterfilter.py
@@ -87,7 +87,7 @@ class GrondwaterFilter(AbstractDovType):
         XmlField(name='meetnet_code',
                  source_xpath='/filter/meetnet',
                  definition='Tot welk meetnet behoort deze filter.',
-                 datatype='integer',
+                 datatype='string',
                  xsd_type=XsdType(
                      xsd_schema=_filterDataCodes_xsd,
                      typename='MeetnetEnumType')),

GrondwaterFilter: meetnet_code should be string
The `meetnet_code` XML attribute of the GrondwaterFilter type should be of type 'string' instead of 'integer'.

The next release of the DOV XML schema introduces "meetnet 20 – eDOV erkende boorbedrijven" with code `edov`.

This will cause issues in current pydov implementation:
```python
ValueError: invalid literal for int() with base 10: 'edov'
```
diff --git a/tests/test_search_grondwaterfilter.py b/tests/test_search_grondwaterfilter.py
index 9f086a9..9eff847 100644
--- a/tests/test_search_grondwaterfilter.py
+++ b/tests/test_search_grondwaterfilter.py
@@ -208,4 +208,4 @@ class TestGrondwaterfilterSearch(AbstractTestSearch):
             return_fields=('pkey_filter', 'gw_id', 'filternummer',
                            'meetnet_code'))
 
-        assert df.meetnet_code[0] == 8
+        assert df.meetnet_code[0] == '8'

pip install -e .[dev]
parse_log_pytest
requirements.txt
pytest
apt-get update apt-get install -y gcc
3.6
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
attrs==22.2.0
certifi==2021.5.30
charset-normalizer==2.0.12
idna==3.10
importlib-metadata==4.8.3
iniconfig==1.1.1
numpy==1.16.6
OWSLib==0.18.0
packaging==21.3
pandas==0.24.2
pluggy==1.0.0
py==1.11.0
-e git+https://github.com/DOV-Vlaanderen/pydov.git@e1416c87f12a3290b37fe380a3ee4961df21d432#egg=pydov
pyparsing==3.1.4
pyproj==3.0.1
pytest==7.0.1
python-dateutil==2.9.0.post0
pytz==2025.2
requests==2.27.1
six==1.17.0
tomli==1.2.3
typing_extensions==4.1.1
urllib3==1.26.20
zipp==3.6.0

name: pydov
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - certifi=2021.5.30=py36h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.3=he6710b0_2
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=1.1.1w=h7f8727e_0
  - pip=21.2.2=py36h06a4308_0
  - python=3.6.13=h12debd9_1
  - readline=8.2=h5eee18b_0
  - setuptools=58.0.4=py36h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - wheel=0.37.1=pyhd3eb1b0_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - attrs==22.2.0
      - charset-normalizer==2.0.12
      - idna==3.10
      - importlib-metadata==4.8.3
      - iniconfig==1.1.1
      - numpy==1.16.6
      - owslib==0.18.0
      - packaging==21.3
      - pandas==0.24.2
      - pluggy==1.0.0
      - py==1.11.0
      - pyparsing==3.1.4
      - pyproj==3.0.1
      - pytest==7.0.1
      - python-dateutil==2.9.0.post0
      - pytz==2025.2
      - requests==2.27.1
      - six==1.17.0
      - tomli==1.2.3
      - typing-extensions==4.1.1
      - urllib3==1.26.20
      - zipp==3.6.0
prefix: /opt/conda/envs/pydov

tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_xmlresolving
tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_pluggable_type tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_get_fields tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_both_location_query tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_returnfields tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_returnfields_subtype tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_returnfields_order tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_wrongreturnfields tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_wrongreturnfieldstype tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_query_wrongfield tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_query_wrongfield_returnfield tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_extrareturnfields tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_sortby_valid tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_sortby_invalid tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_xml_noresolve tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_propertyinlist tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_join tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_get_fields_xsd_values tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_get_fields_no_xsd tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_get_fields_xsd_enums tests/test_search_grondwaterfilter.py::TestGrondwaterfilterSearch::test_search_date
docs/output_fields.rst pydov/types/grondwaterfilter.py
docs/output_fields.rst pydov/types/grondwaterfilter.py