diff --git a/common/const.h b/common/const.h
index 1c4b7d3f..7da40acf 100644
--- a/common/const.h
+++ b/common/const.h
@@ -610,16 +610,9 @@
 
 #define	CONTENTS_LADDER				-16
 
-#define	CONTENT_FLYFIELD			-17
-#define	CONTENT_GRAVITY_FLYFIELD	-18
-#define	CONTENT_FOG					-19
-
-#define CONTENT_EMPTY	-1
-#define CONTENT_SOLID	-2
-#define	CONTENT_WATER	-3
-#define CONTENT_SLIME	-4
-#define CONTENT_LAVA	-5
-#define CONTENT_SKY		-6
+#define	CONTENTS_FLYFIELD			-17
+#define	CONTENTS_GRAVITY_FLYFIELD	-18
+#define	CONTENTS_FOG					-19
 
 // channels
 #define CHAN_AUTO			0
diff --git a/dlls/CBaseEntity.h b/dlls/CBaseEntity.h
index e2cbba32..bc1ef30a 100644
--- a/dlls/CBaseEntity.h
+++ b/dlls/CBaseEntity.h
@@ -122,7 +122,6 @@ class EXPORT CBaseEntity
 	virtual int		ObjectCaps(void) { return FCAP_ACROSS_TRANSITION; }
 	virtual void	Activate(void) {}
 	virtual int		GetEntindexPriority() { return ENTIDX_PRIORITY_NORMAL; }
-	virtual bool	ForceVisChecks() { return false; } // return true for invisible ents that normally skip VIS checks in AddToFullPack
 	virtual Vector	GetTargetOrigin() { return pev->origin; } // origin used for monster pathing and targetting
 
 	// Setup the object->object collision box (pev->mins / pev->maxs is the object->world collision box)
diff --git a/dlls/env/CEnvSound.cpp b/dlls/env/CEnvSound.cpp
index 0bf120b7..6be07378 100644
--- a/dlls/env/CEnvSound.cpp
+++ b/dlls/env/CEnvSound.cpp
@@ -8,7 +8,6 @@ class CEnvSound : public CPointEntity
 {
 public:
 	virtual int	GetEntindexPriority() { return ENTIDX_PRIORITY_NORMAL; } // TODO: needed for VIS checks but it shouldn't be
-	virtual bool ForceVisChecks() { return true; }
 	void KeyValue(KeyValueData* pkvd);
 	void Spawn(void);
 
@@ -209,8 +208,8 @@ void CEnvSound::Spawn()
 	// spread think times
 	pev->nextthink = gpGlobals->time + RANDOM_FLOAT(0.0, 0.5);
 
-	// must set a model for rehlds to call AddFullToPack
-	SET_MODEL(edict(), "models/player.mdl");
+	// model is needed for rehlds to call AddToFullPack
+	SET_MODEL(edict(), NOT_PRECACHED_MODEL);
 	pev->rendermode = kRenderTransTexture;
-	pev->renderamt = 0;
+	m_hidePlayers = 0xffffffff; // do visibility checks but don't network the entity.
 }
diff --git a/dlls/hooks/hlds_hooks.cpp b/dlls/hooks/hlds_hooks.cpp
index 95944e45..002abcba 100644
--- a/dlls/hooks/hlds_hooks.cpp
+++ b/dlls/hooks/hlds_hooks.cpp
@@ -1203,10 +1203,8 @@ int AddToFullPack( struct entity_state_s *state, int e, edict_t *ent, edict_t *h
 	// solid entities should always be sent to clients for collision prediction
 	bool solid = ent->v.solid >= SOLID_BBOX && ent->v.modelindex;
 
-	bool forceVisChecks = baseent->ForceVisChecks();
-
-	if (invisible && !forceVisChecks && !solid) {
-		return 0; // exit now unless a vis check was requested for this ent
+	if (invisible && !solid) {
+		return 0; 
 	}
 
 	CBasePlayer* plr = (CBasePlayer*)GET_PRIVATE(host);
@@ -1226,7 +1224,7 @@ int AddToFullPack( struct entity_state_s *state, int e, edict_t *ent, edict_t *h
 		return 0;
 	}
 
-	if ((invisible && !solid) || forceVisChecks || (baseent->m_hidePlayers & plrbit)) {
+	if (baseent->m_hidePlayers & plrbit) {
 		return 0;
 	}
 
diff --git a/dlls/player/CBasePlayer.cpp b/dlls/player/CBasePlayer.cpp
index d41ce907..006a2709 100644
--- a/dlls/player/CBasePlayer.cpp
+++ b/dlls/player/CBasePlayer.cpp
@@ -1422,12 +1422,12 @@ void CBasePlayer::WaterMove()
 		}
 	}
 
-	if (pev->watertype == CONTENT_LAVA)		// do damage
+	if (pev->watertype == CONTENTS_LAVA)		// do damage
 	{
 		if (pev->dmgtime < gpGlobals->time)
 			TakeDamage(VARS(eoNullEntity), VARS(eoNullEntity), 10 * pev->waterlevel, DMG_BURN);
 	}
-	else if (pev->watertype == CONTENT_SLIME)		// do damage
+	else if (pev->watertype == CONTENTS_SLIME)		// do damage
 	{
 		pev->dmgtime = gpGlobals->time + 1;
 		TakeDamage(VARS(eoNullEntity), VARS(eoNullEntity), 4 * pev->waterlevel, DMG_ACID);
@@ -3076,7 +3076,7 @@ void CBasePlayer::PostThink()
 	{
 		// ALERT ( at_console, "%f\n", m_flFallVelocity );
 
-		if (pev->watertype == CONTENT_WATER)
+		if (pev->watertype == CONTENTS_WATER)
 		{
 			// Did he hit the world or a non-moving entity?
 			// BUG - this happens all the time in water, especially when