woo yeah yeah woo

code/modules/pool/pool_controller.dm

@@ -225,31 +225,32 @@
 	process_reagents()
 
 /obj/machinery/pool/controller/proc/process_pool()
-	if(!drained)
-		for(var/mob/living/M in mobs_in_pool)
-			switch(temperature) //Apply different effects based on what the temperature is set to.
-				if(POOL_SCALDING) //Scalding
-					M.adjust_bodytemperature(50,0,500)
-				if(POOL_WARM) //Warm
-					M.adjust_bodytemperature(20,0,360) //Heats up mobs till the termometer shows up
-				//Normal temp does nothing, because it's just room temperature water.
-				if(POOL_COOL)
-					M.adjust_bodytemperature(-20,250) //Cools mobs till the termometer shows up
-				if(POOL_FRIGID) //Freezing
-					M.adjust_bodytemperature(-60) //cool mob at -35k per cycle, less would not affect the mob enough.
-					if(M.bodytemperature <= 50 && !M.stat)
-						M.apply_status_effect(/datum/status_effect/freon)
-			if(ishuman(M))
-				var/mob/living/carbon/human/drownee = M
-				if(!drownee || drownee.stat == DEAD)
-					return
-				if(drownee.resting && !drownee.internal)
-					if(drownee.stat != CONSCIOUS)
-						drownee.adjustOxyLoss(9)
-					else
-						drownee.adjustOxyLoss(4)
-						if(prob(35))
-							to_chat(drownee, "<span class='danger'>You're drowning!</span>")
+	if(drained)
+		return
+	for(var/mob/living/M in mobs_in_pool)
+		switch(temperature) //Apply different effects based on what the temperature is set to.
+			if(POOL_SCALDING) //Scalding
+				M.adjust_bodytemperature(50,0,500)
+			if(POOL_WARM) //Warm
+				M.adjust_bodytemperature(20,0,360) //Heats up mobs till the termometer shows up
+			//Normal temp does nothing, because it's just room temperature water.
+			if(POOL_COOL)
+				M.adjust_bodytemperature(-20,250) //Cools mobs till the termometer shows up
+			if(POOL_FRIGID) //Freezing
+				M.adjust_bodytemperature(-60) //cool mob at -35k per cycle, less would not affect the mob enough.
+				if(M.bodytemperature <= 50 && !M.stat)
+					M.apply_status_effect(/datum/status_effect/freon)
+		if(ishuman(M))
+			var/mob/living/carbon/human/drownee = M
+			if(!drownee || drownee.stat == DEAD)
+				return
+			if(drownee.resting && !drownee.internal)
+				if(drownee.stat != CONSCIOUS)
+					drownee.adjustOxyLoss(9)
+				else
+					drownee.adjustOxyLoss(4)
+					if(prob(35))
+						to_chat(drownee, "<span class='danger'>You're drowning!</span>")
 
 /obj/machinery/pool/controller/proc/set_bloody(state)
 	if(bloody == state)

code/modules/pool/pool_drain.dm

@@ -116,6 +116,10 @@
 	for(var/i in 1 to min(duration, 100))
 		L.setDir(turn(L.dir, 90))
 		sleep(delay)
+		if(QDELETED(L))
+			break
+		if(QDELETED(src))
+			return
 	whirling_mobs -= L
 
 /obj/machinery/pool/filter

code/modules/pool/pool_main.dm

@@ -15,7 +15,9 @@
 	update_icon()
 
 /turf/open/pool/Destroy()
-	controller = null
+	if(controller)
+		controller.linked_turfs -= src
+		controller = null
 	QDEL_NULL(watereffect)
 	QDEL_NULL(watertop)
 	return ..()