diff --git a/src/GraphBLAS-sharp.Backend/Vector/DenseVector/DenseVector.fs b/src/GraphBLAS-sharp.Backend/Vector/DenseVector/DenseVector.fs
index b66c00aa..3865dba9 100644
--- a/src/GraphBLAS-sharp.Backend/Vector/DenseVector/DenseVector.fs
+++ b/src/GraphBLAS-sharp.Backend/Vector/DenseVector/DenseVector.fs
@@ -7,6 +7,35 @@ open Microsoft.FSharp.Quotations
 open GraphBLAS.FSharp.Backend.Predefined
 
 module DenseVector =
+    let containsNonZero<'a when 'a: struct> (clContext: ClContext) (workGroupSize: int) =
+
+        let containsNonZero =
+            <@ fun (ndRange: Range1D) length (vector: ClArray<'a option>) (result: ClCell<bool>) ->
+
+                let gid = ndRange.GlobalID0
+
+                if gid < length then
+                    match vector.[gid] with
+                    | Some _ -> result.Value <- true
+                    | _ -> () @>
+
+        let kernel = clContext.Compile containsNonZero
+
+        fun (processor: MailboxProcessor<_>) (vector: ClArray<'a option>) ->
+
+            let result = clContext.CreateClCell false
+
+            let ndRange =
+                Range1D.CreateValid(vector.Length, workGroupSize)
+
+            let kernel = kernel.GetKernel()
+
+            processor.Post(Msg.MsgSetArguments(fun () -> kernel.KernelFunc ndRange vector.Length vector result))
+
+            processor.Post(Msg.CreateRunMsg<_, _>(kernel))
+
+            result
+
     let elementWise<'a, 'b, 'c when 'a: struct and 'b: struct and 'c: struct>
         (clContext: ClContext)
         (opAdd: Expr<'a option -> 'b option -> 'c option>)
diff --git a/tests/GraphBLAS-sharp.Tests/GraphBLAS-sharp.Tests.fsproj b/tests/GraphBLAS-sharp.Tests/GraphBLAS-sharp.Tests.fsproj
index 3e5dca50..43f08bb3 100644
--- a/tests/GraphBLAS-sharp.Tests/GraphBLAS-sharp.Tests.fsproj
+++ b/tests/GraphBLAS-sharp.Tests/GraphBLAS-sharp.Tests.fsproj
@@ -37,6 +37,7 @@
         <Compile Include="Vector/Convert.fs" />
         <Compile Include="Vector/Reduce.fs" />
         <Compile Include="Vector/ElementWise.fs" />
+        <Compile Include="Vector/ContainsNonZero.fs" />
         <Compile Include="Program.fs" />
     </ItemGroup>
     <Import Project="..\..\.paket\Paket.Restore.targets" />
diff --git a/tests/GraphBLAS-sharp.Tests/Program.fs b/tests/GraphBLAS-sharp.Tests/Program.fs
index 429360b5..db9f2134 100644
--- a/tests/GraphBLAS-sharp.Tests/Program.fs
+++ b/tests/GraphBLAS-sharp.Tests/Program.fs
@@ -40,7 +40,8 @@ let allTests =
           Backend.Vector.ElementWise.mulTests
           Backend.Vector.FillSubVector.tests
           Backend.Vector.FillSubVector.complementedTests
-          Backend.Vector.Reduce.tests ]
+          Backend.Vector.Reduce.tests
+          Backend.Vector.ContainNonZero.tests ]
     |> testSequenced
 
 [<EntryPoint>]
diff --git a/tests/GraphBLAS-sharp.Tests/Vector/ContainsNonZero.fs b/tests/GraphBLAS-sharp.Tests/Vector/ContainsNonZero.fs
new file mode 100644
index 00000000..122304f7
--- /dev/null
+++ b/tests/GraphBLAS-sharp.Tests/Vector/ContainsNonZero.fs
@@ -0,0 +1,96 @@
+module Backend.Vector.ContainNonZero
+
+open Expecto
+open Expecto.Logging
+open GraphBLAS.FSharp.Backend
+open GraphBLAS.FSharp.Tests
+open GraphBLAS.FSharp.Tests.Utils
+open Context
+open Brahma.FSharp
+
+let logger =
+    Log.create "Vector.containsNonZero.Tests"
+
+let context = defaultContext.ClContext
+
+let q = defaultContext.Queue
+
+let correctnessGenericTest<'a when 'a: struct and 'a: equality> isZero containsNonZero (array: 'a []) =
+
+    if array.Length > 0 then
+        let vector = createVectorFromArray Dense array isZero
+
+        let result =
+            match vector.ToDevice context with
+            | ClVectorDense clArray ->
+                let resultCell = containsNonZero q clArray
+                let result = Array.zeroCreate 1
+
+                let res =
+                    q.PostAndReply(fun ch -> Msg.CreateToHostMsg<_>(resultCell, result, ch))
+
+                q.Post(Msg.CreateFreeMsg<_>(resultCell))
+
+                res.[0]
+
+        $"The results should be the same, vector : {vector}"
+        |> Expect.equal result (Array.exists (not << isZero) array)
+
+let testFixtures =
+    let config = defaultConfig
+
+    let wgSize = 32
+
+    let getCorrectnessTestName datatype =
+        sprintf "Correctness on %s, %A" datatype Dense
+
+    [ let containsNonZeroInt =
+          DenseVector.DenseVector.containsNonZero context wgSize
+
+      correctnessGenericTest<int> ((=) 0) containsNonZeroInt
+      |> testPropertyWithConfig config (getCorrectnessTestName "int")
+
+      let containsNonZeroByte =
+          DenseVector.DenseVector.containsNonZero context wgSize
+
+      correctnessGenericTest<byte> ((=) 0uy) containsNonZeroByte
+      |> testPropertyWithConfig config (getCorrectnessTestName "byte")
+
+      let containsNonZeroFloat =
+          DenseVector.DenseVector.containsNonZero context wgSize
+
+      correctnessGenericTest<float> ((=) 0.0) containsNonZeroFloat
+      |> testPropertyWithConfig config (getCorrectnessTestName "float")
+
+      let containsNonZeroBool =
+          DenseVector.DenseVector.containsNonZero context wgSize
+
+      correctnessGenericTest<bool> ((=) false) containsNonZeroBool
+      |> testPropertyWithConfig config (getCorrectnessTestName "bool")
+
+      let containsNonZeroInt =
+          DenseVector.DenseVector.containsNonZero context wgSize
+
+      correctnessGenericTest<int> ((=) 0) containsNonZeroInt (Array.create 1000 0)
+      |> testPropertyWithConfig config (getCorrectnessTestName "int zeros")
+
+      let containsNonZeroByte =
+          DenseVector.DenseVector.containsNonZero context wgSize
+
+      correctnessGenericTest<byte> ((=) 0uy) containsNonZeroByte (Array.create 1000 0uy)
+      |> testPropertyWithConfig config (getCorrectnessTestName "byte zeros")
+
+      let containsNonZeroFloat =
+          DenseVector.DenseVector.containsNonZero context wgSize
+
+      correctnessGenericTest<float> ((=) 0.0) containsNonZeroFloat (Array.create 1000 0.0)
+      |> testPropertyWithConfig config (getCorrectnessTestName "float zeros")
+
+      let containsNonZeroBool =
+          DenseVector.DenseVector.containsNonZero context wgSize
+
+      correctnessGenericTest<bool> ((=) false) containsNonZeroBool (Array.create 1000 false)
+      |> testPropertyWithConfig config (getCorrectnessTestName "bool zeros") ]
+
+let tests =
+    testList "Backend.Vector.containsNonZero tests" testFixtures