Lowering kh/DH

[Ondion]

Hi,

My water even after the RO/DI filtering has 15-16 kh/DH I tested it after adding salt before the water change, in the aquarium its a bit lower about 14-15. How do other people deal with this issue without lowering the pH in the tank? I've got my tank for about 6 months and had my nem for about 3-4months its still really small (one I bought was a tiny baby), and it's not as "plump" for a lack of a better word. This picture was taken about 3 months ago but it looks the same or even a bit less plump than that.

If hardness is not that much of an issue would any one have any other ideas? pH is 8.3 and salinity 1.025.

 

[dakoop]

Muriatic acid can be used to lower

 

[Randy Holmes-Farley]

The ro/di is 0 ppm tds?

what salt mix?

Yes, I have recipes to lower it, but you should rule out test error first.

 

[Ondion]

The ro/di is 0 ppm tds?

what salt mix?

Yes, I have recipes to lower it, but you should rule out test error first.

Thank you for your reply.
It is 0 ppm tds, salt mix i use is iquatics Ocean Reef Pro.
The test kit i've been using is Salifert, i tested water twice with a sample of aquarium water,later prepared more fresh salt water just to see the parameters.

 

[Randy Holmes-Farley]

what alk test?

They do not seem to have much confidence in their formulation specifications:

iQuatics Ocean Reef Pro Mixing Instructions – iQuatics

www.iquaticsonline.co.uk

*Based on a 20-litre mix at 25 degrees Celcius
Ocean Reef Pro Coral when mixed will provide a dkH of between 7 -11

 

[Randy Holmes-Farley]

Here’s an alk reduction recipe. I’d do it in new salt water, lowering the alk very low, then aerate, then use for water changes.

Sodium Bisulfate to Reduce Alkalinity in New Salt Water or in Display Tanks

I just want to record these calculations in their own thread to refer back to in other threads. When alkalinity is too high in new salt water or in a display tank, acid can be used to lower the alkalinity. You can easily use muriatic acid (hydrochloric acid), or sodium bifulfate (e.g...

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