Phosphate is the main cause of algae growth in NSPs and the biggest source of phosphate is your top up water, this filter will remove phosphate from the top up water.  over time the media inside the filter will become fully charged, this filter can be simply emptied and refilled unlike competitors models.

regard testing of top up water or putting new media in once a year is normally best practice

new media available on website.

filter comes with Hozelock fittings will fit most garden hoses