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 Post subject: Re: Sources of potassium
PostPosted: Sep 9th, '09, 07:20 
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I use bananas, dug into the gravel, if you can get them cheap.

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 Post subject: Re: Sources of potassium
PostPosted: Sep 9th, '09, 09:55 
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Seriously, this cant be healthy.
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Yep comfrey is a good source of potassium, however it is also high in nitrogen and phosphorus too so I would only use diluted as a foliar spray and not dosed directly into an AP system.

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 Post subject: Re: Sources of potassium
PostPosted: Oct 28th, '09, 18:57 
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Since the addition of Sodium Chloride is so commonplace with regards to treating fish infections etc, why couldn't you use KCl in its place to achieve the same goal? Both are salts?! Does the antifungal/bacterial properties in the NaCl come from the sodium or the combined salt effect?

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 Post subject: Re: Sources of potassium
PostPosted: Oct 28th, '09, 18:59 
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Oh, and i'd be wary of using normal agricultural fertilisers in an AP system. Broadacre fertilisers contain contaminants - cadmium, lead etc - that can accumulate over time in a recirculating system. Look for low biuret fertilisers.

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 Post subject: Re: Sources of potassium
PostPosted: Oct 28th, '09, 19:15 
Chatty wrote:
Since the addition of Sodium Chloride is so commonplace with regards to treating fish infections etc, why couldn't you use KCl in its place to achieve the same goal? Both are salts?! Does the antifungal/bacterial properties in the NaCl come from the sodium or the combined salt effect

It's principally the chloride ion that mitigates the effect of nitrites... by correcting the osmotic balance within the blood and other bodily fluids...

As far as disease control... I'd have to check... but I think it's also more the chloride that is the primary element...

So, yes... KCl could be used as both a potassium booster and a "salt" treatment...


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 Post subject: Re: Sources of potassium
PostPosted: Oct 30th, '09, 12:25 
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For sulphate of potash your only looking at 4mg/kg, so 4ppm of lead and no cadmium (trust me i test the stuff).
The oly thing bout muriate of potash (KCl) is that the commercial stuff has a waxy coating which doesn't dissolve too readily. If it was dissolved first then strained then added then i don't see a problem with it.
Maybe a mixture of both would be better, coz the plants will use the sulfur and the fish need the chloride. So abit of both would prob be better.


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 Post subject: Re: Sources of potassium
PostPosted: Dec 6th, '18, 08:24 
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Potassium bicarb or lime... Both will up PH. Potassium is quite potent so use sparingly. I used potassium one week and lime next 2 weeks on rotation. Potassium has a shorter buffering period and gets used up quicker while lime will typically last longer as buffer. Using this rotation you will get both calcium and potassium. And manage PH with out too much bouncing around. Add slowly daily untill desired ph is obtained then use in reg rotation. 6.7 is perfect. From my understanding potassium sulfate does not change PH hence why it is used on systems with a already high PH as a potassium fix.


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