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Discus Page Holland • View topic - Building central filter sistems

Building central filter sistems

Discuss the DIY articles, ask the authors questions or suggest your own writeup.

Building central filter sistems

Postby Svetozar Savin » Mon Jun 12, 2006 8:43 am

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Postby Mick Burke » Mon Jun 12, 2006 1:19 pm

Hi Svetozar :welcome:

I don't use a central system, but may I suggest, you give the following information, which may assist the 'experts to offer assistance' ?

What are the parameters of the water at source (Tap / Well / Other?).

What approx size, will all the tanks be, when added togther.

With these two bits of info, it will be easier to speculate, what you need to do to the water (if anything!) and how much you will need to produce, this will help with component sizing etc.

Cheers, Mick B :cool:
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Postby Svetozar Savin » Tue Jun 13, 2006 6:55 am

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Postby Mick Burke » Tue Jun 13, 2006 7:58 am

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Postby Fred Goodall » Wed Jun 14, 2006 3:50 am

Regards,

fred :hat:

"You see things; and you say, 'Why?' But I dream things that never were; and I say, "Why not?""(Bernard Shaw)
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Postby Svetozar Savin » Wed Jun 14, 2006 6:59 am

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Postby Fred Goodall » Wed Jun 14, 2006 11:12 pm

Regards,

fred :hat:

"You see things; and you say, 'Why?' But I dream things that never were; and I say, "Why not?""(Bernard Shaw)
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Postby Tom Krühlmann » Fri Jun 16, 2006 11:57 am

And just some additional info you may find useful: I have attached an AquaMedic level controller with two sensors in my central filtration unit (last chamber = pump chamber). This unit controls a feed pump located in my reservoir and thus, when water level drops in filter due to evaporation (not likely in discus setups ;-) )or due to siphoning out debris or just plain waterchange - sensot will alert controller which will then fire up the feedpump and resupply water to filtration champer which in turn will be returned to tanks.

Works great - saves time and could be expanded further with a magnetic shut-off valve and connection directly to tap / RO water supply.
Regards,

Tom
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Central filtration system.

Postby Nandi Hivatal » Fri Jun 16, 2006 6:59 pm

Hi Svetozar!

I used to operate a centrally filtered system with 24 x 50gallon tanks. They were all identical size, the breeding tanks had a sponge diving the tank in two halves.
A centrally filtered system has many advantages, but it holds just as many disadvantages as well. If there's a little 'bug' in the system somewhere, it will spread over the entire setup in a matter of about 30 minutes if your water turnover rate is somewhere near decent.
For a good turnover rate you should drill two wholes on each tank, as one may not be enough if you don't go the big diameter way.

There's one thing that caught my eye for the very first time the article appeared on my screen and it was the number of tanks you are planning to set up. If you are planning to build 10 big (I assume it means somewhere around 5-600 liters each) tanks for raising fish, then the maximum number of breeding tanks should not be more than maybe 5 or 6. I made the same mistake of setting up my system with 12 breeding pairs and soon I was so packed with fry under marketable size that my RO units just could not cope with the water needs and it all ended up in a disaster. And when there's a tiny little disaster in a central system, a massive one is surely on its way.

And talking about RO units: For a system so big you will need a BIG RO unit. If you undersize it, it's money burned. I would say that the minimum daily production capacity should be near 35-50% of the total amount of water your system holds. This is also a long-term safety investment.
You can get the Merlin system on the market at a very low price these days (under 500 dollars if you know the right man), but I would not recommend them as their ability to retain certain pollutants (nitrate - for a start) is not very good.
I would recommend a system with 2 or 3 150GPD membranes on a 3-pod prefilter rack.
I know that some German breeders recirculate their tank water through a pumped RO unit (which in case of a 3-membrane system is handy anyway), minimising their water bill. A properly functioning RO unit takes all pollutants out of the water (including bacteria cysts and viruses), so they are a perfect solution in case of hard times as well.
You should definately get a unit with an in-line TDS-meter and a pressure gauge to be able to monitor your product water. If the output TDS rises and the pressure drops, it's time to change your prefilter. Also, if the unit you get is not fitted with a flush valve, install one, as the frequent use of it will make the membranes last a lot longer.

A very nice example for a hatchery using central filtration and RO-recirculating system is: XXXXXXXXX(German only). The owner only breeds Red Turqs and Brilliant Turqs, but they are the most beautiful ones I've ever seen. And the priciest as well...

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Postby Fred Goodall » Sat Jun 17, 2006 1:55 am

Hi Nandi

I removed the link for 3 reasons... the first being there was NO detailed information on central filtering, no pictures of central filter setup.
Information on pricing and stock WAS there, so I construe this as another "free advertizement" in violations of forum rules 5 & 7. When you intended to post URL's to commerical sites... run them past a moderator first.

He has a full page talking about a WORKING nitrate filter that he purchased and installed in Feb. of this year and while it reduced his nitrates he still changes 30% of his total volume daily. The information on turn over rate is the "standard" 2 X the total water volume of the system every hour, maxium oxigenation of water berfore it hits the filter bed and staying with water changes to remove organics and phosphates.

For Svetozar's needs.... either Merlin constant flow R.O. system or 3 X 150 gpd R.O. units would work for him... or a a combination of Merlin for all but the breeding tanks. Depending upon Svetozar's tap water nitrate level... the average 90 % rejection of nitrate by the Merlin system might be fine for his use... compared to the average 98% nitrate rejection of TFC R.O. systems.
Regards,

fred :hat:

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Postby Svetozar Savin » Sat Jun 17, 2006 12:51 pm

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Postby Fred Goodall » Sun Jun 18, 2006 12:12 am

Hi Svetozar :welcome:

If you quarantine properly and do NOT "rush" fish through quarantine, you will greatly reduce chance of "problems" in your system. Also... as you plan... each tank to have a "valve" on the pipes for the central filters... this way you can "remove" any "problem" tanks from the central filter system. And... if you want "protection" .... I suggest an UV unit on the out put side of the central filters. That way nothing from "problem" tank can go into any other tanks. You would "size" the UV unit to the "flow rate" of your pump for the central filter. Heaters can be in the sump of the central filter or in special "cartridges" depending upon the style of central filter you end up with.
Regards,

fred :hat:

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Postby Svetozar Savin » Wed Jun 21, 2006 11:23 am

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Postby Fred Goodall » Thu Jun 22, 2006 10:50 am

Regards,

fred :hat:

"You see things; and you say, 'Why?' But I dream things that never were; and I say, "Why not?""(Bernard Shaw)
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