FAQs About Water Evaporation, Make-Up H20:
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Related FAQs: Make-up Water 1, Water Changes for Marine Systems 1, Make-up
Water: Rationale/Use, Gear, Frequency/Amount, Techniques, Water Quality/Adjusting, Trouble/shooting, & Top-Off System s, Controllers, Treating Tapwater, Marine Water Quality,
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Top off water and Testing for RO Water TDS
4/27/09
Bob and the Gang,
<Hello Joe>
Hope all is well.
My 135 G Reef tank loses a lot of water due to evaporation.
I add a fair amount of RO water to top it off weekly.
<Am I to understand you top off the tank once a week? Or do you mean
you lose a lot of water over the course of a week. If you are topping
off only once a week I suggest you try to do it more often, the longer
you wait before topping off the tank, the larger the swings in the
specific gravity of the water your tank will experience>
<There are auto top off devices available to top off the tank for
you and provide a more consistent environment for your tank
inhabitants. Search 'ATO' on the Google search box at the
bottom of WetWebMedia.>
My question is, should I be adding something to my top off water? Never
thought I had too, but I've read a
couple of places where they recommended adding something to keep the PH
up.
<It is possible to buffer the water, but not necessary, assuming you
are testing and adjusting alkalinity as needed. Just continue adding
topping off your tank with RO water, pH swings will be less noticeable
if top offs are done on a small consistent scale like with an ATO. You
can also aerate your top off water to remove CO2 from it prior to
use.>
Also, how can I be sure that my RO unit is working properly (I have the
Coralife Pure-Flo)? Is there something I can use to test the RO water?
I was reading about TDS testing but wasn't sure if that was
necessary.
<I would highly recommend testing the Total Dissolved Solids from
the effluent hose of your RO unit. Membranes do lose their potency over
time from normal use, but this can be accelerated depending on what
chemicals your city adds to the water. Testing TDS is one of the most
simple ways of checking the quality of effluent coming from a RO unit,
and basic TDS meters can be had at a very low cost.>
Thanks.
Joe
<Your welcome.
Josh>
Re: Top off water and Testing for RO Water
4/27/09
Thanks Josh. Yes I'm topping off roughly every week. I usually lose
close to 10 gallons a week! You make a good point about trying to do it
more often to avoid larger swings in specific gravity. I'll
definitely try to
do that.
I'll also look into a TDS tester.
Thanks again.
Joe
<Your welcome, I think you will come to enjoy not carrying full
buckets of water around. Josh>
Salinity and water changes 10/25/07 Hello, I
would like to start by saying that your site and staff members have
been essential in helping me maintain a healthy saltwater aquarium for
many years. <fabulous> I recently upgraded to a 125 gallon tank
which I plan to maintain as FOWLR. I have about 150 lbs of LR and a 6
in. live DSB, SG will be kept around 1.022. <This is too low.
Although most fish can tolerate lower salinities, the micro-crustaceans
and other inverts which put the "live" in live DSB and live
rock need a salinity much closer to natural sea water (ideally,
1.024-1.026). Please see here:
http://www.wetwebmedia.com/spg_salinity.htm> The tank has been
drilled and drains into two connected sumps (30 & 20 gallons
respectively). The 30 gallon houses a refugium with a live DSB, LR, and
two types of macro algae. The 20 gallon has been divided into two
chambers, one with my remora protein skimmer and the other holds a Rio
1300 return pump. My livestock consists of 1 juvenile Koran Angel, 1
Powder Brown Tang, 1 Tiger Wardii Goby, and about 40 Nassarius snails.
Since this will be my first adventure with a tank this size, I was
seeking your advice concerning husbandry. Given the inhabitants and
system, how much water should I change on a weekly basis? <5 to 10%
weekly or 20 to 40% monthly. Please see here:
http://www.wetwebmedia.com/water.htm> Also, do you recommend keeping
the SG relatively low if I do not plan to add corals? <No, please
see above.> Thank you for your time and advice. Kiet
<De nada,
Sara M.>