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Thread: High Ph
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15-11-2021, 09:04 AM #1
High Ph
Guys. My pond is 4500 gallons and is nearly 2 years old. Ph has always been spot on around 7.5. Today to my shock the ph test was dark blue in other words 9+
Ammonia is zero along with nitrates. Another worry is the KH is zero too. Water looks crystal clear and the fish look happy. I want to add some bicarbonate to raise the KH but reluctant to do so due to the high Ph.
We’re in the rainy season here so I would have thought that the Ph would be low not high……….. any ideas what it could be?
Neil
Attachment 38703Attachment 38704Attachment 38705
Last edited by ndwgolf; 15-11-2021 at 09:13 AM.
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15-11-2021, 10:23 AM #2
Added about 2kg of sodium bicarbonate 30 minutes ago. KH now 7 Ph back to 7.5. Hopefully that’s it…….. I will add another 2kg of Bicarbonate tomorrow……… I’m saying 2kg but I didn’t weigh it. This 2 Litre jug was filled to the top.
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15-11-2021, 10:28 AM #3
That sounds a canny ph swing ??
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"we are water keepers first"
Johnathan
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15-11-2021, 10:43 AM #4
In two years I’ve never seen the Ph above 7.5. And I tested it from the surface of the pond and also at the discharge of the bio filter system both were dark blue with zero drops on the KH
KH has always been all over the place I recon I go through a quarter of a 25kg bag per month…..I’ve been lazy this last couple of weeks but it’s an eye opener to keep a better eye on it
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15-11-2021, 10:59 AM #5
Just taking a wild shot at this but have you had a bloom in blanketweed?
In summer when my pond gets a lot of sun the blanketweed can go a little mental. PH always seems to rise when this happens.
I always have aqua source resolve on hand now.
Other than that not entirely sure
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15-11-2021, 11:20 AM #6
Here is a wee clip of my pond taken 15 minutes ago. I don’t have any plants and no algae
https://youtube.com/shorts/TUvA5MDg00g?feature=share
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15-11-2021, 11:21 AM #7
I dose with bicarb as well as my sorce water is pretty much 0 kh . I didn't keep a eye last winter and lost half my pond all my big uns gone . . But am meaning with the first post was is 9+ down to 7.5 in the matter of minutes a bit much for the fish ??
Sent from my SM-G973F using TapatalkFreddyboy the legend
"we are water keepers first"
Johnathan
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15-11-2021, 12:59 PM #8
At 4,500 gallons I think you’ll find the maximum recommended dose to avoid shocking the fish is 450gms in one hit
13,243 gallons, Filtreau HF30’s K1 capacity of 1,400l, Bakki Shower, BHM and understanding wife
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15-11-2021, 06:48 PM #9Fibreglassed/5000 gals/4.5 m Tunnel/Spindrifter/Twin drums/Bio chambers/Beads/Showers/Remora ASHP
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15-11-2021, 07:47 PM #1034,000L, 2xSpindrifters, Aqua Sieve2, Nexus300, 24in K1/bead, Momotaro Bakki, 17kwThermotec Inverter
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15-11-2021, 08:21 PM #11
Thinking about it bicarb would only take the ph down to 8.3 as that’s its natural level so it can’t go lower. Are you sure your test kit is not out of date or something? Assuming bicarb there is the same as bicarb here?
13,243 gallons, Filtreau HF30’s K1 capacity of 1,400l, Bakki Shower, BHM and understanding wife
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16-11-2021, 12:00 AM #12
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16-11-2021, 12:02 AM #13
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16-11-2021, 12:11 AM #14
KH and PH aren’t the same, the bicarb would lift the KH, and the more you add the higher the KH will go but the PH of bicarb is 8.3 I believe so if you add a lot of bicarb it will move the ph up or down to 8.3. I’ve always read that you should be careful of KH and PH shock and adding the amount of bicarb to shift parameters by the amount you have in one go would seem to move them
too quickly. If you add 450gms of bicarb to a 4,500 gl pond I think it would lift your KH by around 1 so by doing it at that rate you’ll lift your on safely. Depending on your ph level will dictate what will happen to your ph but it will slowly move towards 8.3 then regardless of how much you throw in it will stay at 8.3
As an aside a KH of zero will normally be at risk of the water turning acidic, in other words ph going down not upLast edited by Djstiles999; 16-11-2021 at 12:13 AM.
13,243 gallons, Filtreau HF30’s K1 capacity of 1,400l, Bakki Shower, BHM and understanding wife
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16-11-2021, 01:42 AM #15
KH this morning was 5. Ph 7.5. When I checked yesterday 1 hour after adding the Sodium bicarbonate the KH was 7 Ph was the same 7.5.
Before I left for golf this morning I added another 2litre jug of Sodium Bicarbonate and hopefully by the time I get home the KH will have settled around 10
We have had a lot of rain so I’m guessing that maybe had something to do with it but if rain Ph is about 5 why would my initial check show 9+?
I will update this afternoon after golf
Neil
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16-11-2021, 03:37 AM #16
Just checked the water again and the KH is 9 with the Ph at 7 to 7.5 Ammonia 0 to 0.25 Nitrites zero................All good Thanks
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16-11-2021, 07:53 AM #17
To reiterate that KH shouldn’t be raised too fast (I.e. not by 4 in one dose of bicarb) this link may help
Alkalinity13,243 gallons, Filtreau HF30’s K1 capacity of 1,400l, Bakki Shower, BHM and understanding wife
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16-11-2021, 08:09 AM #18
DJ is right as he says.
Manky Sanke is the man for this,but Neil the rain could have a lot to do with it and I think your pond will settle down when the rain stops.
Keeping kh round 5 to 6 is fine in my book good luck with it Neil and well spotted.John
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16-11-2021, 10:11 AM #19
The Ph of my tap water is 5.5 to 6. KH is zero
Ph of Peroni is bloody marvelous
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16-11-2021, 10:19 AM #20
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Best plants to remove Nitrate
pug has a very impressive veg filter on his pond, have a look at some of his his youtube videos....