0.17 and 0.06 phosphate from ro/di

[Thizz]

after battling high phosphates in my tank and going nuts trying to figure out where its coming from, i finally started to think outside the box and decided to check my ro/di water...

used a hanna ulr checker
checked 2 different units twice in 30 min increments

1st unit does have older filters/membrane - 0.17ppm
2nd unit has 3 month old filters/membrane - 0.06ppm

BOTH units showing 0 TDS verified with inline and handheld

both units are the exact same BRS 4 stage value plus 75gpd

what the heck is going on? i get replacing filters, but every 4 months while making less than 50 gallons of ro/di a month????

EDIT: I have very low pressure here at only about 40-50 psi, could this somehow be the cause?

 

[gbroadbridge]

after battling high phosphates in my tank and going nuts trying to figure out where its coming from, i finally started to think outside the box and decided to check my ro/di water...

used a hanna ulr checker
checked 2 different units twice in 30 min increments

1st unit does have older filters/membrane - 0.17ppm
2nd unit has 3 month old filters/membrane - 0.06ppm

BOTH units showing 0 TDS verified with inline and handheld

both units are the exact same BRS 4 stage value plus 75gpd

what the heck is going on? i get replacing filters, but every 4 months while making less than 50 gallons of ro/di a month????

EDIT: I have very low pressure here at only about 40-50 psi, could this somehow be the cause?

Test some freshly mixed salt water

 

[Thizz]

.04 on the freshly mixed

 

[gbroadbridge]

.04 on the freshly mixed

I would not worry about that level.

The amount of Phosphate added to a tank on a daily basis is far greater than that.

Have a read about phosphate sources in the below article.

https://reefkeeping.com/issues/2006-09/rhf/index.php

 

[Randy Holmes-Farley Verified Community Expert]

That's not a significant contributor to your overall phosphate balance. It might sound scary, but you add tens to hundreds of times as much phosphate each day from foods.

.