diff --git a/js/common/EFACQueryParameters.js b/js/common/EFACQueryParameters.js
index eed7d0ad..f58e94f2 100644
--- a/js/common/EFACQueryParameters.js
+++ b/js/common/EFACQueryParameters.js
@@ -72,8 +72,13 @@ define( require => {
       type: 'array',
       defaultValue: defaultElements,
       elementSchema: { type: 'string' },
-      isValidValue: values => _.difference( values, defaultElements ).length === 0 &&
-                              values.length <= EFACConstants.MAX_NUMBER_OF_INTRO_ELEMENTS,
+      isValidValue: values => {
+        const beakers = _.filter( values, value => value === EFACConstants.WATER_KEY || value === EFACConstants.OLIVE_OIL_KEY );
+
+        return _.difference( values, defaultElements ).length === 0 &&
+        values.length <= EFACConstants.MAX_NUMBER_OF_INTRO_ELEMENTS &&
+        beakers.length <= EFACConstants.MAX_NUMBER_OF_INTRO_BEAKERS;
+      },
       public: true
     }
 
diff --git a/js/intro/EFACIntroScreen.js b/js/intro/EFACIntroScreen.js
index 75f63c2d..76499c43 100644
--- a/js/intro/EFACIntroScreen.js
+++ b/js/intro/EFACIntroScreen.js
@@ -43,7 +43,7 @@ define( require => {
       };
 
       const blocksToCreate = [];
-      let beakersToCreate = [];
+      const beakersToCreate = [];
 
       // map query parameter string to element type and split by blocks vs beakers
       EFACQueryParameters.elements.forEach( elementKey => {
@@ -61,12 +61,6 @@ define( require => {
         }
       } );
 
-      if( beakersToCreate.length > EFACConstants.MAX_NUMBER_OF_INTRO_BEAKERS ) {
-        assert && assert( false, `Only ${EFACConstants.MAX_NUMBER_OF_INTRO_BEAKERS} beakers may be added, but \
-${beakersToCreate.length} were provided: ${beakersToCreate}` );
-        beakersToCreate = beakersToCreate.slice( 0, EFACConstants.MAX_NUMBER_OF_INTRO_BEAKERS );
-      }
-
       super(
         () => new EFACIntroModel(
           blocksToCreate,