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View Full Version : Low PH is a sign of what????


krzyphsygy
08/20/2006, 08:36 PM
My PH runs at 8.0-8.1 during the day and 7.9-7.7 at night. my ALK is 3.0-3.5 megs. Calcium is 420 Mag 1350 and Nitrate is around 10. What can I do to raise it???

Billybeau1
08/20/2006, 08:48 PM
The reason it is higher during the day is photosynthisis. The reason way its low all the time is probably CO2. Happens to most of us during the summer months when the house is closed up.

Read this and do the aeration test to verify.

Low pH: Causes and cures
http://reefkeeping.com/issues/2004-09/rhf/index.htm

Boomer
08/20/2006, 09:18 PM
A .1 pH difference is a nice. Most have .2 or more from day to night if they are not dripping kalk. Your shift is normal and not out of line but it would be nicer it was .1 -.2 points higher day-night.

The algae during the day pick up CO2 to use in photosynthisis, is what Billy is getting at. Little CO2 in the water causes the pH to rise. At night the plants are usaully resting and give off CO2, which lowers the pH. The Alk means nothing /say as CO2 has no efect on it.

Your pH is a tad low so the article Billy posted should help.

Randy Holmes-Farley
08/21/2006, 06:18 AM
If that doesn't help, just pop back. :)

krzyphsygy
08/21/2006, 05:14 PM
Well I have been keeping my windows open in the house for hours on end which does raise it, however I think that is just a bandaid. I came home today from work at 5pm and it was 7.8 with the lights on for 6 1/2 hours. It is not consistant and thats what I am looking for.

Randy Holmes-Farley
08/21/2006, 06:50 PM
Try the aeration tests in the article. It may be the tank is just not aerated enough, even with normal CO2 in the surrounding air.

krzyphsygy
08/22/2006, 10:22 AM
I did try the aeration test. What happened was when I took the cup outside for 1 hour the ph rose to 8.3, when I aerated it inside...it barely rose at all. When I open the sliding glass door the PH always rises to 8.1...if I leave it closed it will not rise at all.

Billybeau1
08/22/2006, 10:40 AM
Well then CO2 is the issue in your case. Some people have had luck running an air line from outside to their skimmer. If thats not feasible, dripping limewater from lights off to lights on should help with your swings.

Randy Holmes-Farley
08/22/2006, 02:15 PM
I agree. More fresh air to the room with the tank, and more limewater are the best options.

oldsaltman
08/22/2006, 02:25 PM
If you only drip the limewater at night what do you do during the daytime? Use stright RO? I think if I go 6 - 8 hrs without any makeup I may run short on water, and I would then be forced to run my kalk for several minutes to catch up. That is bad too. What is best?:(

Randy Holmes-Farley
08/22/2006, 02:43 PM
I use limewater 24/7, but those who drip only at night do not usually add anything during the day.

How much do you evaporate each day? If it is too much for your system, you can add fresh water then.

Limewater 24/7 may be the best option.

rigleautomotive
08/22/2006, 02:46 PM
i ran a hose to fresh air to my ETS downdraft skimmer yesterday.my ph rose .1 to.15 more than usual.it helped me .i was already dripping kalk with a high ph in tank of 8.15 and a low of 7.9.

h20cooled
08/22/2006, 03:05 PM
I'm in the same boat, but I run kalk 24/7 and it makes no difference. I've tried the skimmer airline outside and the CA reactor drip into the skimmer so that it bleeds off t he co2 and nothing has helped.

Billybeau1
08/22/2006, 03:12 PM
h20, are you mixing your kalk at saturation ? (2 tsp per gal)

h20cooled
08/22/2006, 03:21 PM
I have a kalk reactor with a magnetic stir bar it is set to stir every 2 hours, so I would guess that it is to the saturation point.

Rich

Billybeau1
08/22/2006, 03:24 PM
I have no experience with kalk reactors. Randy or Jonathan will chime in shortly. :D

Serioussnaps
08/22/2006, 03:26 PM
limewater 24/7 ...start with 3/4 tsp per gallon and work up based on your ph and evap rate......my ph day time used to be 8.05 and 7.85 at night...since dripping kalk 8.14 at night and 8.29 during day....i used a peristalic/refurbished medical pump called the nautilus from .....

www.innovativeaquatics.com

the best 180 bucks i have spent on tank IMO besided the skimmer but that was more than 180 bucks so for cost/benefit i believe it is the best thing i have bought to date

h20cooled
08/22/2006, 03:28 PM
Wow that is a great pH. I'm in the process of upgrading my tank and I'm hoping to fix this issue with the new tank.

Randy Holmes-Farley
08/22/2006, 05:09 PM
Limewater reactors often produce less than saturated limewater. That is a drawback of them. You might check the effluent for potency. Conductivity is best, but ph can be used. Compare side by side to for sure saturated limewater ( 2 teaspoons in a cup of fresh water). A difference of 0.3 pH units means half saturated.

That said, limewater added to a reef aquarium always has a big pH raising effect, but not always enough if there is really high CO2 in the home air.

h20cooled
08/22/2006, 06:35 PM
I'm going to do the aeration test and see what happens.

krzyphsygy
08/22/2006, 07:50 PM
<a href=showthread.php?s=&postid=7990613#post7990613 target=_blank>Originally posted</a> by rigleautomotive
i ran a hose to fresh air to my ETS downdraft skimmer yesterday.my ph rose .1 to.15 more than usual.it helped me .i was already dripping kalk with a high ph in tank of 8.15 and a low of 7.9.
When you say ran a hose to the skimmer......what do you mean??? Where did it run to??

MJAnderson
08/22/2006, 09:29 PM
<a href=showthread.php?s=&postid=7992932#post7992932 target=_blank>Originally posted</a> by krzyphsygy
When you say ran a hose to the skimmer......what do you mean??? Where did it run to??

Run a hose from outside the house to the venturi intake on your skimmer.

krzyphsygy
08/22/2006, 09:31 PM
I do not have a venturi....I have a Downdraft!!!

Randy Holmes-Farley
08/23/2006, 06:04 AM
You can still pump air from the outside to just in front of the intake(s), but don't just hook the intake to a long hose because that may greatly reduce the skimming action by reducing the air flow.

rigleautomotive
08/23/2006, 08:11 AM
KRZY____is there an intake on the downdraft where it takes in air.i have a downdraft ETS 600 and on the injector there is a barbed connector.run the hose from the barbed connector to outside air.ph still staying pretty good after 3 days.8.08 to 8.25 was the range in the last 24 hours.this mod raised my ph .1

krzyphsygy
08/23/2006, 10:03 PM
<a href=showthread.php?s=&postid=7995738#post7995738 target=_blank>Originally posted</a> by rigleautomotive
KRZY____is there an intake on the downdraft where it takes in air.i have a downdraft ETS 600 and on the injector there is a barbed connector.run the hose from the barbed connector to outside air.ph still staying pretty good after 3 days.8.08 to 8.25 was the range in the last 24 hours.this mod raised my ph .1
As a matter of fact yes....there is. I will test it and let you know....Thanks

whalloper
08/24/2006, 06:33 PM
I was having similar problems as many of you (low pH due to high CO2 levels in the house - Im an air-conditioning freak!!) Here's what I did and it helped:

At first I tried running the airline to my skimmer to the outside but that didnt seem to be enough (little change in pH)

Then, for more fresh air, I bought a Coralife Super Luft Pump and ran a 1/2" hose outside for the air intake to 4 airstones in my sump. This helped raise pH about .15 units.

Then I started using kalk... I have a 4 day supply in a top-off bucket running 24/7 and a Tom's Aqua Lifter pump (uses airline tubing) to pump it into the sump. There is a flow control valve on the tubing that enters the sump so it drips.

Before these modifications my pH was 7.6 night to 7.8 day , and now it is 8.0 night to 8.2 day

pmike25
08/24/2006, 07:34 PM
Wow very interesting reading ,,thanks guys!!! Ill be reading along.

Billybeau1
08/24/2006, 07:35 PM
Take that, CO2. :lol:

Way to go whalloper :thumbsup: