Whats up with drop checker liquid prices?

[PedroB]

Is there a global shortage of this chemical?

Every store sells only the 15ml bottles and at 5 pounds a pop. I remember buying 100ml for under 10 quid.
Is there anywhere cheaper?

 

[Cor]

You could try Aqua Rebell CO2 Check, 250 ml, it's about 15 euro

 

[Stuart_B]

Is there a global shortage of this chemical?

Every store sells only the 15ml bottles and at 5 pounds a pop. I remember buying 100ml for under 10 quid.
Is there anywhere cheaper?

I wasn't sure if you were speaking about the bottles of ready made up solution or bottles of just the Bromothymol Blue which you add in to 4DKH

I had a bottle of the made up solution but it was years old so I looked on Ebay and all I could see were bottles of the reagent alone or sales of a combo of the reagent and the 4DKH .
I bought one of the latter which was 50ml of 4DKH and 5ml of the reagent and that was just under a fiver which I thought was pricey .

I did later find aquaessentials had bottles of made up solution ....100ml at £4.49 and 250ml at £6.29 which would have been a better buy

https://www.aquaessentials.co.uk/co2-accessories-c-194_199.html

 

[zozo]

Buy a bottle of demineralized water, hop into the LFS and buy a pot Kh + or buy baking soda (Natriumbicarbonate).. Both are the same..
Demineralized water has a kH = 0 if you add 0,2 grams of baking soda to 1 litre of Demi water the kH will be aprox. 4 Dkh.. This you can check with a kH drop test.. Than you'll have 1 litre of DkH fluid for a long time to come. The little deviation is actualy quite neglectable since it all about vieweing a color in the end, that makes it rather inacurate to beging with. Co2 should be stable, it doesn't realy make a differnce to write home about if you have a stable 27ppm or a 32 ppm instead.

If you insist on more accuracy you need to scale it up, leaving you with a 10 litre cannister fluid.

You need a little weight scale to measure 0,2 grams of baking soda.. Nowadays these are rather cheaply available and quite accurate.

0.001
https://www.banggood.com/Wholesale-...Scales-Portable-Digital-Electron-p-42092.html

or 0.01
https://www.banggood.com/300g-x-0_01g-Digital-Mini-Portable-Pocket-Jewelry-Weight-Balance-Scale-p-981197.html

 

[zozo]

Hi Oops btw i have to correct myself.. .. Using potassium bicarbonate to make 4DkH fluid you need to put 0.12 gram into a litre of demiwater. Since it takes ages to use a litre it was very long ago i made it and still not used 10%. I accidently missed/forgot a digit.

Anyway the formula not to forget is this.. (Write it on the bottle, i obviously didn't)

KHCO3 in grams/84x1000x2.8 = dKH p/l

0.12/84x1000x2,8 = 4