diff --git a/src/specificClass.js b/src/specificClass.js
index 3aeef2f..bd5af1b 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -150,6 +150,14 @@ class Reactor {
       return;
     }
 
+    if (reactorChild.functionality.positionVsParent != "upstream") {
+      this.logger.warn("Reactor children of reactors should always be upstream.");
+    }
+
+    if (math.abs(reactorChild.d_x - this.d_x) / this.d_x < 0.025) {
+      this.logger.warn("Significant grid sizing discrepancies between adjacent reactors! Change resolutions to match reactors grid step, or implement boundary value interpolation.");
+    }
+
     this.upstreamReactor = reactorChild;
     reactorChild.downstreamReactor = this;