Spark is launching a new DNS-based protection service called Net Shield.
This is available to Spark broadband users and can be managed from their account.
As this is DNS-based your network won't be protected if using a third-party DNS (OpenDNS, Google DNS, 184.108.40.206, etc) or a VPN.
A free service provide basic protection - websites with harmful content and SafeSearch. A paid option expands this to include blocking sites by categories, scheduling and whitelist access only.