Nanoreefbro
Member
Just checked my TDS reading and the input is 4 and the output is 2. It's been almost a year since I changed my DI cartridge. It's probably about time huh?
I take it he means it is 4 at the RO output which is the DI input
Yes Nano, it is time to think about it. Some actually let it go longer like 4 in your case.
OCEAN REEF + 1 FIVE STAGE 75 GPD RO/DI from thefilterguyz.biz
What's your reading from the tap?