diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18356dae5..9d6535ecf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,12 @@ All notable changes to this project will be documented in this file.
 
 [#397]: https://github.com/stackabletech/operator-rs/pull/397
 
+### Changed
+
+- BREAKING: Memory and CPU resource definitions use quantity instead of String ([#402])
+
+[#402]: https://github.com/stackabletech/operator-rs/pull/402
+
 ## [0.19.0] - 2022-05-05
 
 ### Changed
diff --git a/src/commons/resources.rs b/src/commons/resources.rs
index de2ef937c..c6ae7bdb4 100644
--- a/src/commons/resources.rs
+++ b/src/commons/resources.rs
@@ -89,7 +89,7 @@ where
 
 // Defines memory limits to be set on the pods
 // Is generic to enable adding custom configuration for specific runtimes or products
-#[derive(Clone, Debug, Deserialize, Default, Merge, JsonSchema, PartialEq, Serialize, Eq)]
+#[derive(Clone, Debug, Deserialize, Default, Merge, JsonSchema, PartialEq, Serialize)]
 #[merge(path_overrides(merge = "crate::config::merge"))]
 #[serde(rename_all = "camelCase")]
 pub struct MemoryLimits<T>
@@ -98,7 +98,7 @@ where
 {
     // The maximum amount of memory that should be available
     // Should in most cases be mapped to resources.limits.memory
-    pub limit: Option<String>,
+    pub limit: Option<Quantity>,
     // Additional options that may be required
     #[serde(default)]
     pub runtime_limits: T,
@@ -117,9 +117,9 @@ pub struct NoRuntimeLimits {}
 #[merge(path_overrides(merge = "crate::config::merge"))]
 #[serde(rename_all = "camelCase")]
 pub struct JvmHeapLimits {
-    pub max: Option<String>,
+    pub max: Option<Quantity>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
-    pub min: Option<String>,
+    pub min: Option<Quantity>,
 }
 
 // Cpu limits
@@ -128,8 +128,8 @@ pub struct JvmHeapLimits {
 #[merge(path_overrides(merge = "crate::config::merge"))]
 #[serde(rename_all = "camelCase")]
 pub struct CpuLimits {
-    pub min: Option<String>,
-    pub max: Option<String>,
+    pub min: Option<Quantity>,
+    pub max: Option<Quantity>,
 }
 
 // Struct that exposes the values for a PVC which the user should be able to influence
@@ -137,7 +137,7 @@ pub struct CpuLimits {
 #[merge(path_overrides(merge = "crate::config::merge"))]
 #[serde(rename_all = "camelCase")]
 pub struct PvcConfig {
-    pub capacity: Option<String>,
+    pub capacity: Option<Quantity>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub storage_class: Option<String>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
@@ -160,7 +160,7 @@ impl PvcConfig {
                     requests: Some({
                         let mut map = BTreeMap::new();
                         if let Some(capacity) = &self.capacity {
-                            map.insert("storage".to_string(), Quantity(capacity.to_string()));
+                            map.insert("storage".to_string(), capacity.clone());
                         }
                         map
                     }),
@@ -184,15 +184,15 @@ where
         let mut limits = BTreeMap::new();
         let mut requests = BTreeMap::new();
         if let Some(memory_limit) = self.memory.limit {
-            limits.insert("memory".to_string(), Quantity(memory_limit.to_string()));
-            requests.insert("memory".to_string(), Quantity(memory_limit));
+            limits.insert("memory".to_string(), memory_limit.clone());
+            requests.insert("memory".to_string(), memory_limit);
         }
 
         if let Some(cpu_max) = self.cpu.max {
-            limits.insert("cpu".to_string(), Quantity(cpu_max));
+            limits.insert("cpu".to_string(), cpu_max);
         }
         if let Some(cpu_min) = self.cpu.min {
-            requests.insert("cpu".to_string(), Quantity(cpu_min));
+            requests.insert("cpu".to_string(), cpu_min);
         }
 
         ResourceRequirements {
diff --git a/src/config/merge.rs b/src/config/merge.rs
index aa7f62637..324c87a0d 100644
--- a/src/config/merge.rs
+++ b/src/config/merge.rs
@@ -1,4 +1,4 @@
-use k8s_openapi::apimachinery::pkg::apis::meta::v1::LabelSelector;
+use k8s_openapi::apimachinery::pkg::{api::resource::Quantity, apis::meta::v1::LabelSelector};
 use std::{
     collections::{btree_map, hash_map, BTreeMap, HashMap},
     hash::Hash,
@@ -131,6 +131,7 @@ impl Atomic for i128 {}
 impl Atomic for isize {}
 impl Atomic for bool {}
 impl Atomic for String {}
+impl Atomic for Quantity {}
 impl<'a> Atomic for &'a str {}
 impl Atomic for LabelSelector {}