Replacing ro/di filters etc

[lastlight]

Hi,

I have been running my aquasafe 100 gpd unit for about a year and never got around to changing any filters or resin. I read that the filters need to be replaced every six months or else the membrane itself willbe destroyed.

I'm battling some crazy algae now and I'm thinking it's my water. I intend to get a tds meter soon but for now I'd like to know whether i need to replace all filters AND membrane?

The tank is about 75 gallons and i change about 10 gallons every 2 weeks an topoff a gallon or two a day as well.

Thanks guys

Brett