The fertigation dosing pump should be installed in a full hydraulic bypass.
An in-line installation is possible but not recommended because it does not enable the dosing pump to be easily isolated for maintenance (the water supply must be turned off). A by-pass installation enables the system to be supplied with clean mains water when the fertigation dosing pump is not operating and enables it to be easily dismantled.
To prolong your D90GL fertigation dosing pump service life, it should be fitted with an upstream filter (e.g. 200 to 120 mesh - 80 to 130 microns, depending on the quality of your water). This precaution is essential if the water contains impurities or particles, especially if the water comes from a well or if it is surface water.