RO analysis

[egor66]

• Hello. Help me figure out the result of the water analysis after reverse osmosis. I'm confused by the low amount of Na. the first column is the analysis after filtering. the second column is tap water. I'm sorry for the Google translator.
  

 

[dw1305]

Hi all,
Welcome to UKAPS,

• Hello. Help me figure out the result of the water analysis after reverse osmosis. I'm confused by the low amount of Na. the first column is the analysis after filtering. the second column is tap water. I'm sorry for the Google translator.

To be honest it is really pure water straight out of the tap. If you look at the units you have "milligrams / litre" (ppm or 10^-6) and "micrograms / litre" (ppb or 10^-9), so they are all really low values from the tap.

Conductivity meters are quite useful <"Invert suggestions"> for an over-view of the water.

Reverse Osmosis doesn't include any <"ion exchange"> (so you haven't swapped a calcium (Ca++) for two sodium ions (Na+)), a really good RO unit should remove all ions, and your unit has done a pretty good job.

If you wanted even purer water? You would need a DI unit (RO plus an ion exchange filter), but I don't think you need it (in fact I don't think you need the RO unit).

cheers Darrel

 

[egor66]

in fact I don't think you need the RO unit

Thank you for your reply.
The thing is that the carbonate hardness of tap water is 4 units. I am trying to keep plants of the tonina genus.
So I have to purify the water, then add hardness salts up to gh5. Accordingly, kh remains 0-1.
However, I cannot grow plants. I have problems stopping growth points. Leaf curling.
This is provided that there is good light, intensive supply of carbon dioxide and application of fertilizers according to the estimative index system.
So I am thinking. Perhaps low NA values of 0.1ppm are bad and should I add a little?

 

[dw1305]

Hi all,

The thing is that the carbonate hardness of tap water is 4 units. I am trying to keep plants of the tonina genus.

That would make sense - <"KH <= GH">.

You can always deplete (just) the alkalinity (dKH - carbonate hardness) with an acid addition. @Andy Pierce uses 1 mol. hydrochloric acid (HCl) <"Tropica soil raising my KH">, but he understands what he is doing and <"I prefer citric acid (C6H8O7)"> mainly because I'm a pretty poor scientist. I'd also had some humic compounds (from dead Oak (Quercus) leaves or Alder (Alnus) "cones" <"All the leaves are brown… — Seriously Fish">).

So I have to purify the water, then add hardness salts up to gh5.

I actually think that is your problem, you need a lot fewer calcium (Ca++) and magnesium (Mg++) ions and less hardness (dGH) all around. You are going to add magnesium (Mg) with your fertiliser addition and you only need to add a very minimal amount of calcium (Ca) (via CaSO4.2H2O or CaCl.2H2O).

I think that you may have iron (Fe) deficiency, have a look at: <"What is the “Duckweed Index” all about?">

This is provided that there is good light, intensive supply of carbon dioxide and application of fertilizers according to the evaluation index system.

Estimative Index? I'd use much, much leaner dosing, these are plants from very nutrient (and base) poor environments.

Perhaps low NA values of 0.1ppm are bad and should I add a little?

Plants don't have an absolute sodium (Na) requirement, so I don't think it is a problem.

cheers Darrel

 

[egor66]

Hi all,

That would make sense - <"KH <= GH">.

You can always deplete (just) the alkalinity (dKH - carbonate hardness) with an acid addition. @Andy Pierce uses 1 mol. hydrochloric acid (HCl) <"Tropica soil raising my KH">, but he understands what he is doing and <"I prefer citric acid (C6H8O7)"> mainly because I'm a pretty poor scientist. I'd also had some humic compounds (from dead Oak (Quercus) leaves or Alder (Alnus) "cones" <"All the leaves are brown… — Seriously Fish">).

I actually think that is your problem, you need a lot fewer calcium (Ca++) and magnesium (Mg++) ions and less hardness (dGH) all around. You are going to add magnesium (Mg) with your fertiliser addition and you only need to add a very minimal amount of calcium (Ca) (via CaSO4.2H2O or CaCl.2H2O).

I think that you may have iron (Fe) deficiency, have a look at: <"What is the “Duckweed Index” all about?">

Estimative Index? I'd use much, much leaner dosing, these are plants from very nutrient (and base) poor environments.

Plants don't have an absolute sodium (Na) requirement, so I don't think it is a problem.

cheers Darrel

 

[egor66]

Estimative Index?

Forgot to clarify. I use soil ista.
Regarding gh. More precisely Ca 24 ppm, Mg 7 ppm.
I apply slightly less fertilizer than recommended.
weekly dosage.

 

[dw1305]

Hi all,

Regarding gh. More precisely Ca 24 ppm, Mg 7 ppm.

Do you have these as separate salts? (MgSO4.7H2O etc) or are they via a commercial mix? If they are separate salts? Just add ~ 5 ppm (mg / l) of both minerals.

I use soil ista.

I had to look that one up, do you mean the liquid fertilizer? <"Soil & Fertilizer_Water Plant System_Water Plant Fertilizer_Products | ISTA Taiwan _ Tzong-Yang Aquarium"> or <"Soil & Fertilizer_Water Plant System_Premium Water Plant Fertilizer_Products | ISTA Taiwan _ Tzong-Yang Aquarium">?

cheers Darrel

 

[egor66]

Hi all,

Do you have these as separate salts? (MgSO4.7H2O etc) or are they via a commercial mix? If they are separate salts? Just add ~ 5 ppm (mg / l) of both minerals.

I had to look that one up, do you mean the liquid fertilizer? <"Soil & Fertilizer_Water Plant System_Water Plant Fertilizer_Products | ISTA Taiwan _ Tzong-Yang Aquarium"> or <"Soil & Fertilizer_Water Plant System_Premium Water Plant Fertilizer_Products | ISTA Taiwan _ Tzong-Yang Aquarium">?

cheers Darrel

Absolutely right. They use dry salts. Calcium sulfate and magnesium sulfate.
Substrate ista