if(selectedProductFilters.isNotEmpty){
      List<CategoryProductData> filteredProducts = [];
      for (var selectedFilter in selectedProductFilters) {
        reagents.where((v) => v.ordering == 2).toList().forEach((allproduct) {
          allproduct.linkedProducts?.forEach((element) {
            if(element.title == selectedFilter){
              filteredProducts.add(allproduct);
            }
          });
        });
        if(selectedBrandFilters.isNotEmpty){
          List<CategoryProductData> brandFilteredData = [];
          for (var brand in selectedBrandFilters) {
            if(selectedParameterFilters.isNotEmpty) {
              filteredProducts.where((v) => v.ordering == 2).toList().forEach((element) {
                if (element.brand == brand &&
                    (selectedParameterFilters.contains(element.tags))) {
                  brandFilteredData.add(element);
                }
              });
            }
            else{
              filteredProducts.where((v) => v.ordering == 2).toList().forEach((element) {
                if (element.brand == brand) {
                  brandFilteredData.add(element);
                }
              });
            }
          }
          filteredData.value = brandFilteredData;
        }
        else if(selectedParameterFilters.isNotEmpty){
          filteredProducts.where((v) => v.ordering == 2).toList().forEach((element) {
            if (selectedParameterFilters.contains(element.tags)) {
              filteredData.add(element);
            }
          });
        } else{
          filteredData.value = filteredProducts;
        }
      }
    }
    //no product filters selected
    else if(selectedBrandFilters.isNotEmpty){
      for (var brand in selectedBrandFilters) {
        if(selectedParameterFilters.isNotEmpty) {
          reagents.where((v) => v.ordering == 2).toList().forEach((element) {
            if (element.brand == brand &&
                (selectedParameterFilters.contains(element.tags))) {
              filteredData.add(element);
            }
          });
        }
        else{
          reagents.where((v) => v.ordering == 2).toList().forEach((element) {
            if (element.brand == brand) {
              filteredData.add(element);
            }
          });
        }
      }
    }
    //only parameter filter
    else if(selectedParameterFilters.isNotEmpty){
      reagents.where((v) => v.ordering == 2).toList().forEach((element) {
        if (selectedParameterFilters.contains(element.tags)) {
          filteredData.add(element);
        }
      });
    }