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Old 05-13-2014, 01:54 AM   #11
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The salinity of salt water from LFS can not be at 1.030. Assuming the OP hydrometer is accurate then the salinity has to be readjusted prior to pwc. Usually the LFS salt water is about 1.020 which is good for fish tank only.
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Old 05-13-2014, 09:08 AM   #12
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What's a TDS meter?
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Old 05-13-2014, 09:16 AM   #13
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A meter that tests Total Dissolved Solids in your water sample.

Sent from my SCH-I545 using Aquarium Advice mobile app
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Old 05-13-2014, 10:46 AM   #14
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With this you can see if your water is 99.9% pure. I'm reading 0ppm TDS in my RODI water, it means the water is so pure it does not conduct electricity.

And that's this level of purety you need in reef aquariums

I'll suggest you mix your own salt. I'm using RedSea salts, this is the best IMO, params are all high. Make sure you add salt to the clean water, and not the inverse.

If you have FOWLR tank, then go with cheaper salt like Fluval Sea Salts.

SG for:
1.020 = fish only
1.023 = LPS tank
1.025 = SPS tank.

Most hydrometers aren't accurate, so I keep mine at 1.023, but I know in real life it's 1.025, as somebody tested my water with a refractometer.
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Old 05-13-2014, 11:06 AM   #15
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Refractometer can be accurate only if they are calibrated properly. I use 3 types so I have an idea if my refractometer is getting out of calibration. Water temperature can also affect the accuracy. You have to add or subtract if reading is not at 72F.
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Old 06-02-2014, 07:47 AM   #16
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Sorry just saw the extra posts- this is a real science. The amount of learning can be overwhelming but thrilling too when all is running great...also.what's OP? I see people are referred to this and have never asked til now.
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Old 06-02-2014, 10:10 AM   #17
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Original Poster of the thread which is you in this case.
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Old 06-02-2014, 02:08 PM   #18
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Thanks Jeff
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