- Jan 19, 2020
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It is a nice to have, not necessarily a must have. Watch the color of the beads in the clear filter. They will turn from blue to brown as they get used up. The TDS meter (Total Dissolved Solids) is a bit more reliable to confirm when it is time to change the resin.Ok Ill get that too but its not needed to test right now right? (First 50 gallons of RODI)
Thanks for the info. It looks like a little bit of the bottom of the resin turned brown but the rest is a good color. Ill get the meter a little later when there is more brown.It is a nice to have, not necessarily a must have. Watch the color of the beads in the clear filter. They will turn from blue to brown as they get used up. The TDS meter (Total Dissolved Solids) is a bit more reliable to confirm when it is time to change the resin.
There are 2 kinds of TDS (total dissolved solids) meters.
Handheld: Fill a cup with some water then stick it in and see what it says.
In-line: You attach this to the tubing directly. This one has 2 sensors, you put one before and one after the DI resin (clear filter with blue beads). The one before tells you if the RO (reverse osmosis) membrane is working correctly (should read <10). The one after the DI resin confirms the water is clean (should read 0). They have to be installed correctly, so check YouTube for a movie (BRS has one)
Sometimes problems happen with the rodi system, especially when you’ve never used one. When that’s the case, you could be using water that’s only partially filtered, or maybe not at all.Ok Ill get that too but its not needed to test right now right? (First 50 gallons of RODI)
Most test kits will pick up nitrites and report them as nitrates. Don't bother testing nitrates until your nitrites and ammonia are down to 0.So on BRS it says that once nitrates are present then the initial cycle has ended and there is bacteria in the tank. But I know to wait until ammonia and nitrites are at 0.
I put dr times one and only and dr tim’s ammonia yesterday. How do I already have nitrites and nitrates?
@Randy Holmes-Farley Is this the correct salinity/calibration? It’s 35 on the right but that’s %?Here's a recipe for a standard (for refractometers only):
Title photo by R2R member Rskillz By Randy Holmes-Farley Salinity is one of the most important parameters measured in reef aquaria. It controls not only the salt balance between an organism and its surrounding environment, but also the levels of a host of ions Read more here...www.reefedition.com
Do-it-yourself Refractometer Standards
In a previous article I described how to make a do-it-yourself refractometer standard matching 35 ppt seawater, and I will just summarize that recipe here.
To provide a standard for refractometers requires a solution whose refractive index is similar to normal seawater. Seawater with a salinity of 35 ppt has a refractive index of 1.3394. Likewise, the refractive index of different sodium chloride solutions can be found in the scientific literature. My CRC Handbook of Chemistry and Physics (57th Edition, Page D-252) has such a table. That table has entries for 3.6 and 3.7 weight percent solutions of sodium chloride that span the value for normal seawater. Interpolating between these data points suggests that a solution of 3.65 weight percent sodium chloride has the same refractive index as 35 ppt seawater, and therefore can be used as an appropriate standard (Table 5).
This 3.65 weight percent sodium chloride solution can be made by dissolving 3.65 grams of sodium chloride in 96.35 grams (mL) of purified freshwater. This recipe can be scaled to any appropriate size if suitable instruments are available (36.5 grams in 963.5 grams (mL) of water, 0.365 grams in 9.635 g (mL) of water, etc.).
This concentration roughly corresponds to ¼ cup (73.1 g) of Morton’s Iodized Salt dissolved into two liters (2000 g) of water (giving very slightly more than 2 L of total volume).
The way to lower your salinity is to add more fresh RODI water.That means I have a 1.035 or 45 ppt of salinity. How do I get that lower? Because my alk will also be high right?
Yeah that’s what i’ve been doing rn. Already got it down 1 ppt . I’ll keep doing that. Technically the alk and everything else should go down with it right?Is the picture shown your result? If so, it is around 35 ppt.
if not, it can be lowered slowly by removing salt water and replace with RO/di