Recommend a good brand of GH tester.

**noidea** · 27th Sep 2014, 11:17

Currently, I am using sera GH liquid tester. But it seem not to be working. It always show yellow color regardless of how many drops I have put inside.

From the manual it suppose to turn from red to green. But it is not happening.

**Suzerolt** · 27th Sep 2014, 11:56

Shake the reagent bottle well before use as it may settle over time.

After each drop of reagent that you drop into your test bottle/ give it a quick shake.
For me, i know my GH is roughly 8, so i start shaking after 5 drops.

Most brands should be good enough. I'm using API

**noidea** · 27th Sep 2014, 13:13

Originally Posted by Suzerolt

Shake the reagent bottle well before use as it may settle over time.

After each drop of reagent that you drop into your test bottle/ give it a quick shake.
For me, i know my GH is roughly 8, so i start shaking after 5 drops.

Most brands should be good enough. I'm using API

I have shake the bottle but all the result for tap water and tank water still show yellow color after many drops.

Thanks, I will try API GH tester.

**MCE** · 1st Oct 2014, 17:21

I had the same problem, however I shake...more than 15 drops still the same color.

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**wongce** · 1st Oct 2014, 18:52

Gh test kit expires quite fast compared to other test kits. better check expiry date before you buy. My sera GH test kit last around 8 month ( from the day i open the fresh bottle)

**noidea** · 1st Oct 2014, 20:11

Originally Posted by MCE

I had the same problem, however I shake...more than 15 drops still the same color.

Sent from my iPhone using Tapatalk

I did the same number of drop as you. Result the same as you.

**noidea** · 1st Oct 2014, 20:15

Originally Posted by wongce

Gh test kit expires quite fast compared to other test kits. better check expiry date before you buy. My sera GH test kit last around 8 month ( from the day i open the fresh bottle)

Thanks for the advise.

I had pour a few dose of Seachem Replenish into my tank. Somehow the GH test kit show slight color change to greenish yellow. Maybe my tank water really have no GH.

**Urban Aquaria** · 1st Oct 2014, 22:45

Are you using RO/DI water in the tank?

**noidea** · 2nd Oct 2014, 16:20

Originally Posted by Urban Aquaria

Are you using RO/DI water in the tank?

No, just tap water.

**Urban Aquaria** · 2nd Oct 2014, 17:27

Originally Posted by noidea

No, just tap water.

I see... i guess although its possible for tap water in some parts of Singapore to also show 0-1 GH (which would in turn also influence the tank water GH too), it looks like you'll just have to use another brand of GH Test Kit to double-check the results.

**noidea** · 2nd Oct 2014, 20:24

Originally Posted by Urban Aquaria

I see... i guess although its possible for tap water in some parts of Singapore to also show 0-1 GH (which would in turn also influence the tank water GH too), it looks like you'll just have to use another brand of GH Test Kit to double-check the results.

Noted. Thanks. I try to find other brand but the packaging like very old and dusty and no expire date. I bought another sera GH test kit and let see what happen.

**MCE** · 3rd Oct 2014, 13:30

Originally Posted by Urban Aquaria

I see... i guess although its possible for tap water in some parts of Singapore to also show 0-1 GH (which would in turn also influence the tank water GH too), it looks like you'll just have to use another brand of GH Test Kit to double-check the results.

actually, we can find out GH of tap water in rough estimate by reading the pool water testing report in the estate/condo etc. Every pool must have water tested weekly and the report outlines detailed water param.

**Urban Aquaria** · 3rd Oct 2014, 13:37

Originally Posted by MCE

actually, we can find out GH of tap water in rough estimate by reading the pool water testing report in the estate/condo etc. Every pool must have water tested weekly and the report outlines detailed water param.

Thats interesting... but wouldn't the pool water parameters be affected by rain water, various pool filtration processes and water treatment chemicals/disinfectants?

**noidea** · 16th Oct 2014, 23:32

I tested today with a small tub of tap water and then I add one cap full of seachem replenish.

I use a sera GH test kit, it show the color changes to brown but the number of drop to 21 and it did not change to green. I use a TDS meter to test it, it show no number.

Later, I change to another batch of new water. Put one mark of the cap of seachem replenish. The GH test kit show it change from brown to green at about 12 drops.

I guess the test kit work but my tap water is zero on GH. IMHO.