RO/DI TDS is 1 PPM

[SMSHAPERO]

I have an Aquamaxx Puratek RO/DI system with a booster pump. I started using it about 4 months ago. I don't use it every day. Only when I need water for top-off and salt mixing. I have 4 aquariums the largest is 40 gallons. It was producing water at 0 PPM. Last week it was producing water at 1 PPM. All of the cartridges are 4 months old. What should I do? I would prefer my water to be 0 PPM. Is 1 PPM OK?
I look forward to everyones expert advice. I have only been doing this for a couple of years.

 

[Stephen8169301]

Honestly I’d say anything under 5 is good but me personally id only go for zero how many times did you check it with your meter?

 

[blaxsun]

I mean, a TDS of 1 isn't ideal - but it's not the end of the world, either. I aim for 0 TDS, but will occasionally get a TDS of 1 as well. If it goes higher I'd probably change out your filters.