Rain water instead of rodi

[GARRIGA]

I have no idea what’s in local rainfalls so I can’t tell if the RO process or the DI process is effective.

To me, it’s easier and safer to start with tap water in most cases, especially if it’s a good large city system.

With factories emitting all sorts of chemicals into the air, this soup is going to make it into the rainwater, and then, into your reef system.

Is that an issue? Maybe or not, it depends a lot on your local rainfall.

If I had no choice, sure, I’d use it. But then I got to collect it, maybe move it, then pressurize it.

My tap does all of that, but of course, for a price.

We are lucky to have great clean delivered water in our city at a very reasonable price, so for me, big city dweller, tap is so much easier.

But I completely respect other sources as well, each comes with there own unique challenges.

But isn’t that tap affected by local rainfall therefore why would I assume it’s any better than my actual rain?

Remember, this is for those not having access to processing their own tap. It’s like saying one should drive a car vs going by horse back yet only roads available only navigable by horse back

 

[Uncle99]

But isn’t that tap affected by local rainfall therefore why would I assume it’s any better than my actual rain?

Remember, this is for those not having access to processing their own tap. It’s like saying one should drive a car vs going by horse back yet only roads available only navigable by horse back

If you have no tap water then of course by all means.

It just the recognition that local rainfalls around the globe differ so buyer beware.

Our water is processed in our water treatment facilities before it makes its way to our home, so it’s no longer just rain water. It’s gray water processed to be fit for human consumption. All waters hear are grey after use. Rainfall is collected in our overflows which are like huge refugiums using plants as part of the process. This is mixed into the grey waters.

The city must post the results quarterly.

But I’m sure that’s no the process around the world.
So just a note of caution.

 

[livinlifeinBKK]

Bleaching from exposure to low salinity water is a fact. It’s typically observed in smaller volumes of water like the rock pool example Ive provided or where a strong persistent halocline developes in a flooded body of water.

Interestingly enough, some corals are able to manage the stress of low salinity better than others.

Your ATO example is also a good one. Of course hobbyists have had SPS bleach after a malfunction. We’re not talking minor changes here, rather full reservoir dumps. Again, when this has happened not all corals have suffered.

Looking at this through the lens of total ocean volume is fundamentally incorrect so I won’t bother with your calculation. It has absolutely no bearing on whether freshwater can bleach corals.

Do I really need explain the context of my post that somehow started this ridiculous tangent? I will if you need me to...just ask.
Do you really think that anyone here doesn't know corals can't survive if the salinity is VERY low? The keyword is VERY btw...

You're right, corals are marine organisms...they cant live in freshwater.

The post I made about dilution was in response to an earlier post that reasoned because it rains over the ocean, there's no reason to even consider rain water might have pollutants which could be harmful. I was saying that the ocean dilutes any pollutants that fall from rain to a pretty good extent, to say the least. I wasn't even talking about the salinity until OP (I assume mistakenly) thought thats what I was talking about.

If you read the entire thread, you'd see that.

Has extreme rainfall ever in history lowered the salinity to the extent it would cause bleaching? There are probably a FEW isolated cases but I'm assuming that because I havent seen any research which concluded bleaching was due SOLELY to a decrease in salinity. If increased sedimentation from runoff was a factor, then why do you continue to insist that bleaching was caused by rain decreasing the salinity?

Btw, it isn't surprising that different species bleach to greater or lesset extents under any stressor you want to choose. If you understand why bleaching occurs and know a little bit about the microbiome it's clearer.

 

[Garf]

Not read the whole thread but measured rainwater at 20us, central England, many years ago.

 

[CoastalTownLayabout]

Do I really need explain the context of my post that somehow started this ridiculous tangent? I will if you need me to...just ask.
Do you really think that anyone here doesn't know corals can't survive if the salinity is VERY low? The keyword is VERY btw...

You're right, corals are marine organisms...they cant live in freshwater.

The post I made about dilution was in response to an earlier post that reasoned because it rains over the ocean, there's no reason to even consider rain water might have pollutants which could be harmful. I was saying that the ocean dilutes any pollutants that fall from rain to a pretty good extent, to say the least. I wasn't even talking about the salinity until OP (I assume mistakenly) thought thats what I was talking about.

If you read the entire thread, you'd see that.

Has extreme rainfall ever in history lowered the salinity to the extent it would cause bleaching? There are probably a FEW isolated cases but I'm assuming that because I havent seen any research which concluded bleaching was due SOLELY to a decrease in salinity. If increased sedimentation from runoff was a factor, then why do you continue to insist that bleaching was caused by rain decreasing the salinity?

Btw, it isn't surprising that different species bleach to greater or lesset extents under any stressor you want to choose. If you understand why bleaching occurs and know a little bit about the microbiome it's clearer.

The context of your post was clear. You waded in with a theoretical approach to dilution that completely missed the practical implications of the OP’s thread and then doubled down by misunderstanding how coral reefs can be affected by precipitation and run off.

 

[GARRIGA]

If you have no tap water then of course by all means.

It just the recognition that local rainfalls around the globe differ so buyer beware.

Our water is processed in our water treatment facilities before it makes its way to our home, so it’s no longer just rain water. It’s gray water processed to be fit for human consumption. All waters hear are grey after use. Rainfall is collected in our overflows which are like huge refugiums using plants as part of the process. This is mixed into the grey waters.

The city must post the results quarterly.

But I’m sure that’s no the process around the world.
So just a note of caution.

I have tap. Just not practical for myself to access and run through RODI based on how my house is configured and where water enters.

However, why would my tap post RODI be purer than rain post RODI? Understand what my municipality does to process our water yet can't see how I'd fail to obtain equally pure from rain. Ultrafiltration can purify down to 0.025 microns which removes most if not all pesticides therefore what would be contained within rain that would survive that process and an option I've considered is running that captured post Ultrafiltration through ozone and UVC before membrane and final polish via DI. Have the means as others to purify to the nth degree but not all of us have access or practical means to obtain tap or well.

I've studies waste water treatment to the point I can go get an entry level job

 

[livinlifeinBKK]

The context of your post was clear. You waded in with a theoretical approach to dilution that completely missed the practical implications of the OP’s thread and then doubled down by misunderstanding how coral reefs can be affected by precipitation and run off.

Can you quote the post where I said that run off has no effect on coral reefs? I also didnt say that there is 0 effect from precipitation... I can help you out by improving your comprehension skills if you'd like.
By the way, try not to make it sound as if you were previously stating that precipitation AND RUNOFF only have "an effect" on reefs. You were very specific in stating that decreased salinity caused by precipitation leads to bleaching. You specified one very specific effect and didn't make mention of any factor, aside from decreased salinity.
"Bleaching from exposure to low salinity water is a fact. It’s typically observed in smaller volumes of water like the rock pool example Ive provided"

I wouldn't have read the links if I wasnt actually interested in reading research on the topic. Id still be intersted in reading if you can offer a link to a study that identified hyposaline conditions from precipitation caused bleaching without other stress factors involved (such as sedimentation caused by runoff).

Do you agree that the ocean dilutes any soluble substance added to it? Please just answer yes or no.

 

[livinlifeinBKK]

You're completely correct in saying that...of course water from landmasses is carried over oceans and falls as rain.

However, the first one to post about rain falling over natural reefs (and I really hope he's the only one) doesn't appear to understand that the ocean is slightly larger than an aquarium. That means ANYTHING is diluted to a far greater extent than it would be in an aquarium. It seems like a very basic concept but maybe it isn't.

@CoastalTownLayabout
If this is the post you're referring to when saying I "waded in with a theoretical approach to dilution", my "theory", if you really consider it a theory, is that a large volume of water will dilute anything added to it to a greater extent than a very small volume of water (obviously whatever is added must be soluble).

People were discussing potential pollutants in rain which is what I was referring to being diluted. Why would you think I was talking about precipitation being diluted in that post?

 

[CoastalTownLayabout]

I wouldn't have read the links if I wasnt actually interested in reading research on the topic. Id still be intersted in reading if you can offer a link to a study that identified hyposaline conditions from precipitation caused bleaching without other stress factors involved (such as sedimentation caused by runoff).

Do you agree that the ocean dilutes any soluble substance added to it? Please just answer yes or no.

Mate, I’m not going to do your homework but I’m happy to point you in the right direction. Look at the research conducted at James Cook University after 2019 flood events affecting GBR. You can navigate on your own from there.

 

[CoastalTownLayabout]

@CoastalTownLayabout
If this is the post you're referring to when saying I "waded in with a theoretical approach to dilution", my "theory", if you really consider it a theory, is that a large volume of water will dilute anything added to it to a greater extent than a very small volume of water (obviously whatever is added must be soluble).

People were discussing potential pollutants in rain which is what I was referring to being diluted. Why would you think I was talking about precipitation being diluted in that post?

The problem with applying a theoretical approach to dilution is that fails to factor in barrier effects caused by local coastal geomorphology, haloclines and tides. These prevent your perfect theoretical dilution to an extent that will affect coral health. You can apply this to salinity, pollutants or sediments.

 

[livinlifeinBKK]

The problem with applying a theoretical approach to dilution is that fails to factor in barrier effects caused by local coastal geomorphology, haloclines and tides. These prevent your perfect theoretical dilution to an extent that will affect coral health. You can apply this to salinity, pollutants or sediments.

Thanks for potentially offering at least something worth looking into tonight!
I doubt youve read it, but Ill take a look anyway.

Btw matey, do you understand what a "theoretical approach" is? Since you can't seem to answer my yes or no question as to whether you agree that a large volume of water will dilute a substance to a greater extent than a tiny volume, it would appear unlikely you have any idea what a theoretical approach is.

You can't answer a yes/no question, understand what my post actually is saying (I even quoted it for you to refresh your memory), and certainly cant even begin to say what my "perfect theoretical dilution" is for a couple reasons...the most obvious being that your sentence doesn't actually make sense....so I don't really see a point in continuing back and forth with you.

It was interesting to see your attempt to completely change what I actually said and I will look into the information you offered later tonight though!

 

[Uncle99]

I have tap. Just not practical for myself to access and run through RODI based on how my house is configured and where water enters.

However, why would my tap post RODI be purer than rain post RODI? Understand what my municipality does to process our water yet can't see how I'd fail to obtain equally pure from rain. Ultrafiltration can purify down to 0.025 microns which removes most if not all pesticides therefore what would be contained within rain that would survive that process and an option I've considered is running that captured post Ultrafiltration through ozone and UVC before membrane and final polish via DI. Have the means as others to purify to the nth degree but not all of us have access or practical means to obtain tap or well.

I've studies waste water treatment to the point I can go get an entry level job

You’re absolutely right.
They are likely both great starting points.

 

[CoastalTownLayabout]

Thanks for potentially offering at least something worth looking into tonight!
I doubt youve read it, but Ill take a look anyway.

Btw matey, do you understand what a "theoretical approach" is? Since you can't seem to answer my yes or no question as to whether you agree that a large volume of water will dilute a substance to a greater extent than a tiny volume, it would appear unlikely you have any idea what a theoretical approach is.

You can't answer a yes/no question, understand what my post actually is saying (I even quoted it for you to refresh your memory), and certainly cant even begin to say what my "perfect theoretical dilution" is for a couple reasons...the most obvious being that your sentence doesn't actually make sense....so I don't really see a point in continuing back and forth with you.

It was interesting to see your attempt to completely change what I actually said and I will look into the information you offered later tonight though!

Classic. The ‘you failed to understand the context of my false claims’ defence is so on trend at the moment. Keep up the good work.

 

[livinlifeinBKK]

Classic. The ‘you failed to understand the context of my false claims’ defence is so on trend at the moment. Keep up the good work.

Hey mate!, sorry been too busy busy with life to bicker with you but when I have time to respond and feel like doing so I will.

My response:
I want to laugh, but its almost sad that you cant bring yourself to answer the yes or no question I asked or admit that you have no idea what a theoretical approach is...I know this because I didn't make a "theoretical approach to dilution". Prove me wrong by pointing it out.
IF YOUR NEXT RESPONSE DOESNT ANSWER BOTH THESE QUESTIONS, YOURE EMBARASSING YOURSELF. IF YOU CANT ANSWER EITHER, SAVE YOURSELF THE EMBARASSMENT AND JUST DONT REPLY.

 

[CoastalTownLayabout]

Hey mate!, sorry been too busy busy with life to bicker with you but when I have time to respond and feel like doing so I will.

That’s perfectly ok mate. Even full time morons deserve a few days off.