diff --git a/growpi.toml b/growpi.toml
index 1c267ba..e83ea8e 100644
--- a/growpi.toml
+++ b/growpi.toml
@@ -1,21 +1,29 @@
 [board_settings]
-logic_level = 3.3
+logic_level = 3.299999952316284
 
 [relay_settings]
 light_pin = 0
 fan_pin = 1
 water_pump_pin = 2
-relay_gpio_pins = [17, 27, 22, -1]
+relay_gpio_pins = [
+    17,
+    27,
+    22,
+    -1,
+]
 
 [soil_moisture_settings]
 pin = 1
-voltage_100 = 1.417
-voltage_nominal = 2.823
-moisture_nominal = 0.41
+voltage_100 = 1.4170000553131104
+voltage_nominal = 2.822999954223633
+moisture_nominal = 0.4099999964237213
 
 [thermistor_settings]
 pin = 0
 voltage_divider_resistance = 9700.0
 nominal_resistance = 10000.0
-nominal_temperature = 298.15
+nominal_temperature = 298.1499938964844
 thermal_constant = 3950.0
+
+[water_pump_settings]
+milliseconds_to_grams = 0.05280999839305878
diff --git a/src/actuators.rs b/src/actuators.rs
index abec3cf..76f2593 100644
--- a/src/actuators.rs
+++ b/src/actuators.rs
@@ -1,3 +1,5 @@
+use std::{thread, time::Duration};
+
 use crate::{
     config::*,
     error::GenericResult,
@@ -27,3 +29,17 @@ pub fn switch_water_pump(
 ) -> GenericResult<()> {
     relay.switch(config.relay_settings.water_pump_pin, state, config)
 }
+
+pub fn pump_water(
+    water_mass_g: u16,
+    relay: &mut Relay,
+    config: &Configuration,
+) -> GenericResult<()> {
+    let duration_ms = water_mass_g as f32 / config.water_pump_settings.grams_per_millisecond;
+    let duration_ms = duration_ms.round() as u64;
+    let duration = Duration::from_millis(duration_ms);
+    switch_water_pump(relay, RelaySwitchState::On, config)?;
+    thread::sleep(duration);
+    switch_water_pump(relay, RelaySwitchState::Off, config)?;
+    Ok(())
+}
diff --git a/src/cli_mode.rs b/src/cli_mode.rs
index 47255c6..82d1207 100644
--- a/src/cli_mode.rs
+++ b/src/cli_mode.rs
@@ -3,6 +3,7 @@ use std::{thread, time::Duration};
 use rustyline::{config::Configurer, error::ReadlineError, history::FileHistory};
 
 use crate::{
+    actuators,
     config::Configuration,
     error::GenericResult,
     io::{self, get_input_voltage},
@@ -25,6 +26,7 @@ fn process_input(
         "rel" => command_rel(&args, program_state, config)?,
         "soil" => command_soil(&args, config)?,
         "temp" => command_temp(&args, config)?,
+        "pump" => command_pump(&args, program_state, config)?,
         "exit" => return Ok(LoopFlags { exit: true }),
         _ => return Err("Unknown main command".into()),
     };
@@ -32,6 +34,31 @@ fn process_input(
     Ok(LoopFlags { exit: false })
 }
 
+fn command_pump(
+    args: &[&str],
+    program_state: &mut ProgramState,
+    config: &Configuration,
+) -> GenericResult<()> {
+    let use_grams = args
+        .get(2)
+        .map(|arg| matches!(*arg, "grams"))
+        .unwrap_or(false);
+
+    if use_grams {
+        let grams: u16 = args.get(1).ok_or("No mass specified.")?.parse()?;
+        actuators::pump_water(grams, &mut program_state.relay, config)?;
+        return Ok(());
+    }
+
+    let duration_ms: u64 = args.get(1).ok_or("No duration specified.")?.parse()?;
+    let duration = Duration::from_millis(duration_ms);
+    actuators::switch_water_pump(&mut program_state.relay, io::RelaySwitchState::On, config)?;
+    thread::sleep(duration);
+    actuators::switch_water_pump(&mut program_state.relay, io::RelaySwitchState::Off, config)?;
+
+    Ok(())
+}
+
 fn command_temp(args: &[&str], config: &Configuration) -> GenericResult<()> {
     let show_loop = args
         .get(1)
diff --git a/src/config.rs b/src/config.rs
index f5853f3..4ba95fb 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -27,6 +27,11 @@ pub struct SoilMoistureSettings {
     pub moisture_nominal: f32,
 }
 
+#[derive(Serialize, Deserialize)]
+pub struct WaterPumpSettings {
+    pub grams_per_millisecond: f32,
+}
+
 #[derive(Serialize, Deserialize)]
 pub struct BoardSettings {
     pub logic_level: f32,
@@ -38,6 +43,7 @@ pub struct Configuration {
     pub relay_settings: RelaySettings,
     pub soil_moisture_settings: SoilMoistureSettings,
     pub thermistor_settings: ThermistorSettings,
+    pub water_pump_settings: WaterPumpSettings,
 }
 
 impl Configuration {
@@ -76,6 +82,9 @@ impl Default for Configuration {
                 nominal_temperature: 298.15,
                 thermal_constant: 3950.,
             },
+            water_pump_settings: WaterPumpSettings {
+                grams_per_millisecond: 0.05281,
+            },
         }
     }
 }