diff --git a/src/components/BlenderLogbook/BlenderLogbook.tsx b/src/components/BlenderLogbook/BlenderLogbook.tsx
index aad9198..fdad63c 100644
--- a/src/components/BlenderLogbook/BlenderLogbook.tsx
+++ b/src/components/BlenderLogbook/BlenderLogbook.tsx
@@ -11,7 +11,7 @@ import { FillingTile } from './components/FillingTile';
 import { SavingTile } from './components/SavingTile';
 import {
   AvailableMixtureCompositions,
-  type AvailableMixtures,
+  AvailableMixtures,
   formalizeGasMixture,
   formatEurToEurCents,
 } from '../../lib/utils';
@@ -60,7 +60,7 @@ const EMPTY_FILLING_EVENT_BASIC_INFO: FillingEventBasicInfo = {
   divingCylinderSetId: '',
   heliumPercentage: '0',
   gasMixture: AvailableMixtureCompositions[0].id,
-  oxygenPercentage: '0',
+  oxygenPercentage: '21',
   userConfirm: false,
   compressorId: '',
 };
@@ -112,11 +112,16 @@ export const NewBlenderFillingEvent: React.FC<NewFillingEventProps> = ({
           .reduce((partialSum, price) => partialSum + price, 0),
       );
 
+      // Allow user to do pure air fills via Happihäkki page
+      const filledAir =
+        values.gasMixture === AvailableMixtures.Nitrox &&
+        values.fillingEventRows.length === 0;
+
       fillEventMutation.mutate(
         {
           cylinderSetId: values.divingCylinderSetId,
           description: values.additionalInformation,
-          filledAir: false,
+          filledAir,
           gasMixture: formalizedGasMixture,
           price: totalPriceEurCents,
           storageCylinderUsageArr:
diff --git a/src/components/BlenderLogbook/components/FillingTile.tsx b/src/components/BlenderLogbook/components/FillingTile.tsx
index 1251880..eb0c5c9 100644
--- a/src/components/BlenderLogbook/components/FillingTile.tsx
+++ b/src/components/BlenderLogbook/components/FillingTile.tsx
@@ -20,9 +20,7 @@ import { type CommonTileProps, emptyFillingRow } from '../BlenderLogbook';
 
 type FillingEventRowProps = CommonTileProps & {
   index: number;
-  replace: (index: number, newValue: unknown) => void;
   remove: (index: number) => void;
-  push: (value: unknown) => void;
   setFieldValue: (
     field: string,
     value: unknown,
@@ -30,20 +28,16 @@ type FillingEventRowProps = CommonTileProps & {
   ) => void;
   storageCylinders: StorageCylinder[];
   gases: GasWithPricing[];
-  lastItem: boolean;
 };
 
 const FillingEventRowComponent: React.FC<FillingEventRowProps> = ({
   index,
   errors,
   values,
-  replace,
   remove,
-  push,
   setFieldValue,
   storageCylinders,
   gases,
-  lastItem,
 }) => {
   const startPressure = values.fillingEventRows.at(index)?.startPressure;
   const endPressure = values.fillingEventRows.at(index)?.endPressure;
@@ -106,11 +100,7 @@ const FillingEventRowComponent: React.FC<FillingEventRowProps> = ({
             disabled={values.userConfirm}
             element={<BsTrash />}
             onClick={() => {
-              index === 0 && values.fillingEventRows.length === 1
-                ? replace(index, {
-                    ...emptyFillingRow(),
-                  })
-                : remove(index);
+              remove(index);
             }}
           />
         </div>
@@ -164,20 +154,6 @@ const FillingEventRowComponent: React.FC<FillingEventRowProps> = ({
           unit="€"
         />
       </div>
-      {lastItem ? (
-        <div className={styles.addRow}>
-          <PrimaryButton
-            disabled={values.userConfirm}
-            onClick={() => {
-              push({
-                ...emptyFillingRow(),
-              });
-            }}
-            type={ButtonType.button}
-            text="Lisää uusi rivi"
-          />
-        </div>
-      ) : null}
     </div>
   );
 };
@@ -203,23 +179,32 @@ export const FillingTile: React.FC<FillingTileProps> = ({
     <div className="pt-3 pb-3 border-bottom">
       <h2>Täyttö</h2>
       <FieldArray name="fillingEventRows">
-        {({ replace, remove, push }) => (
+        {({ remove, push }) => (
           <>
             {values.fillingEventRows.map((row, index) => (
               <FillingEventRowComponent
                 key={row.uniqueId}
                 errors={errors}
                 index={index}
-                push={push}
                 gases={gases}
-                lastItem={values.fillingEventRows.length === index + 1}
                 remove={remove}
-                replace={replace}
                 setFieldValue={setFieldValue}
                 storageCylinders={storageCylinders}
                 values={values}
               />
             ))}
+            <div className={styles.addRow}>
+              <PrimaryButton
+                disabled={values.userConfirm}
+                onClick={() => {
+                  push({
+                    ...emptyFillingRow(),
+                  });
+                }}
+                type={ButtonType.button}
+                text="Lisää uusi rivi"
+              />
+            </div>
           </>
         )}
       </FieldArray>
diff --git a/src/components/BlenderLogbook/validation.ts b/src/components/BlenderLogbook/validation.ts
index a90c45f..fe76712 100644
--- a/src/components/BlenderLogbook/validation.ts
+++ b/src/components/BlenderLogbook/validation.ts
@@ -18,31 +18,27 @@ export const BLENDER_FILLING_EVENT_VALIDATION_SCHEMA = yup.object().shape({
     .max(100)
     .optional(),
   userConfirm: yup.boolean().isTrue(),
-  fillingEventRows: yup
-    .array()
-    .of(
-      yup.object().shape({
-        consumption: yup.number(),
-        priceEurCents: yup.number(),
-        startPressure: yup
-          .number()
-          .typeError(FIELD_NUMBER)
-          .min(0)
-          .required(FIELD_REQUIRED),
-        endPressure: yup
-          .number()
-          .typeError(FIELD_NUMBER)
-          .min(0)
-          .required(FIELD_REQUIRED)
-          .when(['startPressure'], (startPressure, schema) =>
-            schema.max(
-              startPressure as unknown as number,
-              'Loppupaine liian korkea',
-            ),
+  fillingEventRows: yup.array().of(
+    yup.object().shape({
+      consumption: yup.number(),
+      priceEurCents: yup.number(),
+      startPressure: yup
+        .number()
+        .typeError(FIELD_NUMBER)
+        .min(0)
+        .required(FIELD_REQUIRED),
+      endPressure: yup
+        .number()
+        .typeError(FIELD_NUMBER)
+        .min(0)
+        .required(FIELD_REQUIRED)
+        .when(['startPressure'], (startPressure, schema) =>
+          schema.max(
+            startPressure as unknown as number,
+            'Loppupaine liian korkea',
           ),
-        storageCylinderId: yup.string().required(FIELD_REQUIRED),
-      }),
-    )
-    .required()
-    .min(1),
+        ),
+      storageCylinderId: yup.string().required(FIELD_REQUIRED),
+    }),
+  ),
 });