Det kan vara Drainiac! (2000)
Death rises up from the drain in director Bret Piper's inventive, special effects-heavy horror yarn about an old dark house and a vengeful water demon. As Julie Ashbrook and friends begin out an old mansion that's scheduled to be restored, their work is frequently interrupted by a series of strange occurrences involving water. Julie believes that strange forces are at work within the dilapidated estate, but her friends think she's losing her mind. By the time the ancient water demon that inhabits these drain pipes manifests itself in the flesh, Julie and her friends realize that their lives aren't the only things at stake, because this demon wants to devour their bodies and swallow their souls.