Rodi phosphates high what to do

[nightmarepl]

So I’ve ran an rodi for water changes for 2 years now replaced the canisters few times now..
so i checked my fish tank and I’m at .88 on hanna
I checked my rodi with reef crystal mix and it’s .09 shouldn’t that be 0?
Can’t figure out how the hell to bring down my phosphates tanks started to get invaded by cyano algae basically 3 days in invasion…

trying to get my sump setup better running my skimmer basically higher skim to dump every 3 days

tried using chemiclean it cleans it up but comes back after the 2 waters changes

 

[Randy Holmes-Farley Verified Community Expert]

So I’ve ran an rodi for water changes for 2 years now replaced the canisters few times now..
so i checked my fish tank and I’m at .88 on hanna
I checked my rodi with reef crystal mix and it’s .09 shouldn’t that be 0?
Can’t figure out how the hell to bring down my phosphates tanks started to get invaded by cyano algae basically 3 days in invasion…

trying to get my sump setup better running my skimmer basically higher skim to dump every 3 days

tried using chemiclean it cleans it up but comes back after the 2 waters changes

I do not believe that RO/DI is the primary source, assuming your numbers are accurate.

Aquarium Chemistry: Phosphate And Math: Yes You Need To Understand Both

Foods are by far the most important source of phosphate in most aquariums. In considering whether sources of phosphate other than foods are important, one must carefully look to the actual amounts involved to determine whether other sources are even worth trying to minimize.

reefs.com

Comparison of Food Sources of Phosphate to Other Sources
What about other sources of phosphate, like the “crappy” RO/DI water containing 0.05 ppm phosphate? A similar analysis will show it equally unimportant relative to foods.

Let’s assume that the aquarist in question adds 1% of the total tank volume each day with RO/DI to replace evaporation. Simple math shows that the 0.05 ppm in the RO/DI becomes 0.0005 ppm added each day to the phosphate concentration in the aquarium. That dilution step is critical, taking a scary number like 0.05 ppm down to an almost meaningless 0.0005 ppm daily addition. Since that 0.0005 ppm is 40-600 times lower than the amount added each day in foods (Table 4), it does not seem worthy of the angst many aquarists put on such measurements. That said, tap water could have as much as 5 ppm phosphate, and that value could then become a dominating source of phosphate and would be quite problematic. Purifying tap water is important for this and many other reasons.

 

[Troylee]

I do not believe that RO/DI is the primary source, assuming your numbers are accurate.

Aquarium Chemistry: Phosphate And Math: Yes You Need To Understand Both

Foods are by far the most important source of phosphate in most aquariums. In considering whether sources of phosphate other than foods are important, one must carefully look to the actual amounts involved to determine whether other sources are even worth trying to minimize.

reefs.com

Comparison of Food Sources of Phosphate to Other Sources
What about other sources of phosphate, like the “crappy” RO/DI water containing 0.05 ppm phosphate? A similar analysis will show it equally unimportant relative to foods.

Let’s assume that the aquarist in question adds 1% of the total tank volume each day with RO/DI to replace evaporation. Simple math shows that the 0.05 ppm in the RO/DI becomes 0.0005 ppm added each day to the phosphate concentration in the aquarium. That dilution step is critical, taking a scary number like 0.05 ppm down to an almost meaningless 0.0005 ppm daily addition. Since that 0.0005 ppm is 40-600 times lower than the amount added each day in foods (Table 4), it does not seem worthy of the angst many aquarists put on such measurements. That said, tap water could have as much as 5 ppm phosphate, and that value could then become a dominating source of phosphate and would be quite problematic. Purifying tap water is important for this and many other reasons.

My tds is horrible in Vegas! 515 going into my membrane and coming out at 14… it kills di resin fast ugh… I’ve never checked a fresh batch of saltwater for po4 I’m curious now… it’s been a battle to get my po4 down and I’m finally winning since dosing neonitro to get my no3 up a little more..

 

[nightmarepl]

I do not believe that RO/DI is the primary source, assuming your numbers are accurate.

Aquarium Chemistry: Phosphate And Math: Yes You Need To Understand Both

Foods are by far the most important source of phosphate in most aquariums. In considering whether sources of phosphate other than foods are important, one must carefully look to the actual amounts involved to determine whether other sources are even worth trying to minimize.

reefs.com

Comparison of Food Sources of Phosphate to Other Sources
What about other sources of phosphate, like the “crappy” RO/DI water containing 0.05 ppm phosphate? A similar analysis will show it equally unimportant relative to foods.

Let’s assume that the aquarist in question adds 1% of the total tank volume each day with RO/DI to replace evaporation. Simple math shows that the 0.05 ppm in the RO/DI becomes 0.0005 ppm added each day to the phosphate concentration in the aquarium. That dilution step is critical, taking a scary number like 0.05 ppm down to an almost meaningless 0.0005 ppm daily addition. Since that 0.0005 ppm is 40-600 times lower than the amount added each day in foods (Table 4), it does not seem worthy of the angst many aquarists put on such measurements. That said, tap water could have as much as 5 ppm phosphate, and that value could then become a dominating source of phosphate and would be quite problematic. Purifying tap water is important for this and many other reasons.

What do you think would be the best fix for this i was thinking running gfo for a few months to bring the phosphates down and introduce a good amount of chaeto to my sump start harvesting that in high volume which should over the phosphate production

 

[Randy Holmes-Farley Verified Community Expert]

Both macroalgae and GFO are fine plans for phosphate reduction.

 

[nightmarepl]

Both macroalgae and GFO are fine plans for phosphate reduction.

Ok I’ll get. Reactor some gfo and organize some chaeto