no build network on every process

scrubbers by default will scrub toxins.

code/ATMOSPHERICS/atmospherics.dm

@@ -77,7 +77,8 @@ Pipelines + Other Objects -> Pipe network
 // I asked /tg/ and bay and they have no idea why this is here, so into the trash it goes. - N3X
 // Re-enabled for debugging.
 /obj/machinery/atmospherics/process()
-	build_network()
+	//build_network()
+	//testing("[src] called parent process to build_network()")
 
 /obj/machinery/atmospherics/proc/network_expand(datum/pipe_network/new_network, obj/machinery/atmospherics/pipe/reference)
 	// Check to see if should be added to network. Add self if so and adjust variables appropriately.

code/ATMOSPHERICS/components/unary/vent_scrubber.dm

@@ -15,7 +15,7 @@
 	var/on = 0
 	var/scrubbing = 1 //0 = siphoning, 1 = scrubbing
 	var/scrub_CO2 = 1
-	var/scrub_Toxins = 0
+	var/scrub_Toxins = 1
 	var/scrub_N2O = 0
 	var/scrub_O2 = 0
 	var/scrub_N2 = 0
@@ -27,7 +27,7 @@
 	var/radio_filter_out
 	var/radio_filter_in
 	New()
-		..()
+		..()s
 		area_uid = areaMaster.uid
 		if (!id_tag)
 			assign_uid()

code/ATMOSPHERICS/pipes.dm

@@ -149,7 +149,7 @@
 
 /obj/machinery/atmospherics/pipe/simple/process()
 	if(!parent) //This should cut back on the overhead calling build_network thousands of times per cycle
-		..()
+		build_network()
 	else
 		. = PROCESS_KILL