The best fertilizing system today ? - Page 3 - The Planted Tank Forum
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post #31 of 36 (permalink) Old 08-04-2019, 01:47 PM Thread Starter
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Just a question about PPS-Pro. It is recommended to create two 500 ml fertilizer bottles. One with microelements (29 grams of K2SO4, 33 grams of KNO3, 3 grams of KH2PO4 and 20 grams of MgSO4) and the other with microelements (CSM B Plantex). The recommended dosage for 135l is 135/40 = 3.375ml daily macro and 135/40/2 = 1.6875ml micro daily. This implies that the first bottle will be consumed in 500 / 3.375 = 148 days and the second bottle 500 / 1.6875 = 296 days. I'm afraid the bottles will only be fresh for a few days then they will go bad. How many days can fertilizer be stored in liquid form and how best?
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post #32 of 36 (permalink) Old 08-04-2019, 02:22 PM
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It can be kept in dark cabinet and there is no time limit. Still, 500 ml is excessive amount.


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post #33 of 36 (permalink) Old 08-04-2019, 03:53 PM Thread Starter
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One more question. There are two versions of MgSO4 on the market. MgSO4 and MgSO4.7H2O. I found it not the same see https://www.aquaticplantcentral.com/...gso4-7h2o.html.

Which version is used for dosing 20 grams per 500ml (PPS-Pro method) and for reconstruction of RO water (160 grams to 500 grams jar) ?

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It can be kept in dark cabinet and there is no time limit. Still, 500 ml is excessive amount.
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post #34 of 36 (permalink) Old 08-04-2019, 04:12 PM
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You can add directly to RO water

20 ppm Ca, CaSO4.2H2O
5 ppm Mg, MgSO4.7H2O
30 ppm K, K2SO4
2 dKH, NaHCO3 baking soda


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post #35 of 36 (permalink) Old 08-04-2019, 05:48 PM
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Quote:
Originally Posted by hunti View Post
One more question. There are two versions of MgSO4 on the market. MgSO4 and MgSO4.7H2O. I found it not the same see https://www.aquaticplantcentral.com/...gso4-7h2o.html.

Which version is used for dosing 20 grams per 500ml (PPS-Pro method) and for reconstruction of RO water (160 grams to 500 grams jar) ?

Typically you will only find MgSO4.7H2O in our hobby. The MgSO4 is more of a lab grade salt and is rather expensive. Learned all this about 1.5 years ago when I asked the same question.
Also, you will note on sites like https://rotalabutterfly.com/nutrient-calculator.php that they will not list MgSO4, only the MgSO4.7H2O.
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post #36 of 36 (permalink) Old 08-04-2019, 06:36 PM
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Originally Posted by Greggz View Post
I agree.

There is a world of difference between a new sparsely planted tank and a mature tank loaded with established fast growing stems. The rate of nutrient uptake is quite different, and so is optimal dosing.

Plant mass matters.

And that also means controlling plant mass once things take off.

@hunti, if you really want some help, you should post as many parameters as you can about your tank, along with some pictures. A picture is worth a thousand words.

In reality, most times an algae issue has little to do with dosing.
This rings so true it almost hurts. lol I recently pulled up two huge clumps of crypt undulata red and a bunch of bacopa and hygro sunset (fast growing stems) and replaced them. Since doing that, I've had a bloom of what I think is BBA...nothing bad. It's not to the point of wanting to "treat" the tank, just letting it run its course, but the point is even in an established tank that didn't have problems previously, changing things up can even cause issues. OP, the best advice is to do what works for your tank. I'd recommend starting with a dosing method that fits your lifestyle (for instance, if you don't feel like you can do weekly 50% water changes, EI wouldn't be for you), and go from there. You will inevitably alter your regimen to suit your own demands. My best friend is getting more serious about planted tanks, but he's unable to do 50% weekly water changes, so for him I recommended starting out with PPS (or something like it) since he can only get to water changes every 2-3 weeks.
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