Chempak fertiliser precipitate/insoluble component

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Karsty
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Chempak fertiliser precipitate/insoluble component

Post by Karsty » Thu Apr 19, 2018 10:17 pm

Does anyone here use Chempak Cactus & Succulent Fertiliser?

I use it, and there is always a component that will not dissolve, even when I heat the water.

Does anyone know what it is? Is it a precipitate?

I haven't asked Chempak yet. I have found asking the manufacturers questions like these is either a long and drawn out process or results in one answer - fudge!

Thank you for any help :grin:
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Re: Chempak fertiliser precipitate/insoluble component

Post by Andyh » Fri Apr 20, 2018 7:04 am

Also noticed the same and wondered if these concentrated granules are a problem. They accumulate in base of watering can and some plants may end up with a greater dose. So far not noticed plants suffer though.
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Re: Chempak fertiliser precipitate/insoluble component

Post by Terry S. » Fri Apr 20, 2018 7:50 am

You didn't specify a particular Chempak formula. I use Chempak 8 and haven't noticed any particular problem. It is likely that an observation such as this could depend on the nature of the water used.
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DaveW
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Re: Chempak fertiliser precipitate/insoluble component

Post by DaveW » Fri Apr 20, 2018 9:28 am

Could it be the solution had become saturated so no further crystals would dissolve? Try a smaller amount in the same quantity of water in future and see if you have less or no residue undissolved.

The other alternative is once you have used most of the original solution try adding more water to the residue and see if more dissolves? The makers dosage may be on the excess side of the saturation rate, meaning some of the product is wasted, no doubt as that is more profitable. :grin:

https://chem.libretexts.org/Core/Physic ... Saturation

As Terry says though that could simply be a hard or soft water issue where you live, the product dissolving more in one than the other.
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Re: Chempak fertiliser precipitate/insoluble component

Post by BryanW » Fri Apr 20, 2018 10:15 am

Terry S. wrote:You didn't specify a particular Chempak formula. I use Chempak 8 and haven't noticed any particular problem. It is likely that an observation such as this could depend on the nature of the water used.
It isn't one of the numered formula Terry it's this one..
https://www.amazon.co.uk/Chempak-Cactus ... B004KQ4AF6

I was looking at it last night before this topic was started, after seeing Bill H recommending it on his Haworthia pages.
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Re: Chempak fertiliser precipitate/insoluble component

Post by Terry S. » Fri Apr 20, 2018 12:36 pm

I am sure that is a very effective fertilizer Bryan but I have no experience of it. I am a bit of a miser and the problem with it is that I can get the similar Chempak 8 at £4.50 per 800g from the local allotment society. Can I put in a plug for such societies? They are not as cheap as the big boys for compost but I can get the ca. 4mm grit from my local one and also Clover John Innes which is much better than the big brand names.
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Re: Chempak fertiliser precipitate/insoluble component

Post by Nick_G » Fri Apr 20, 2018 1:53 pm

I have noticed this with Chempak Trace Elements feed. You just have to dissolve the fertiliser in a small amount of water first before diluting to the strength required. A bit of a palaver and it takes a fair bit of stirring but it's the only way I've been able to dissolve it all.
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Re: Chempak fertiliser precipitate/insoluble component

Post by BryanW » Fri Apr 20, 2018 6:49 pm

Terry S. wrote:I am a bit of a miser and the problem with it is that I can get the similar Chempak 8 at £4.50 per 800g from the local allotment society.
To be honest Terry, If I had as many plants as your good self I'd be a bit of a miser when it comes to sourcing sundries :wink: . Saying that I just paid a whopping £7.99 for Chempak 8 :shock:
Nick_G wrote:I have noticed this with Chempak Trace Elements feed. You just have to dissolve the fertiliser in a small amount of water first before diluting to the strength required. A bit of a palaver and it takes a fair bit of stirring but it's the only way I've been able to dissolve it all.
I know it's Karsty's thread but that has answered it for me and I shall utilise said preparation forthwith (tu)
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Re: Chempak fertiliser precipitate/insoluble component

Post by Karsty » Fri Apr 20, 2018 9:52 pm

Wow, thanks everybody for a proliferation of responses!

I only use rainwater or RO water, so it is always slightly acid.

Like I said I even heated up the solution to maybe 70C to try to dissolve it and it just would not go.

It's still a mystery to me.....
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Re: Chempak fertiliser precipitate/insoluble component

Post by DavidH » Mon Sep 10, 2018 10:12 pm

Never checked before, but it does seem there is a component of champak No.8 that just does not dissolve.

To mix up 25l of fertiliser mixed 50g in 1l of water to start with, and some of it just did not dissolve.

Drained off most of the water and added another 500ml just in case the solution was saturated - and still seems to lhave left a mostly white residue with a few black specks.
Even dug out my magnetic sturrer not used for years - two hours of sturring later its still there !
Will continue to removed the dissolved parts and adding more water and see if it finally dissolves.

Dave
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