Fine Filtration RO/DI units

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I've seen cheap ro/di units on Amazon (75gpd for £50) and wondered if they were up to the job of supplying water to the new tank I'm getting soon, the tank is 4x2x2 and will have a mixture of smaller reef fish (clowns, Hoevens wrasse, pink spotted goby, royal gramma, coral beauty et al plus soft and lps corals (there may be a few sps as well).

I don't want to buy one if it isn't up to the job, I live in Sheffield and we have very soft water (not sure if this helps but it made the choice of tropical fish far wider than with hard water).

The land shark

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Reply #1

I have the D-D, nice and cheap, gives me 0 tds.  :glad: I fill up a 120L water butt in a day.
Link below if you want to look

http://amzn.eu/avuL4Te

ajm83

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Reply #2

Hi SoulMan, welcome to ReefBase  8D

I've got one of those cheap sets, and it's fine. But I did end up adding an extra triple DI stage as even though I could get 0 TDS, i was still getting low levels of zinc, copper and silicates through which seemed to cause issues with my SPS.

The other thing is 75GPD is not much for a tank of your size. Especially if your water pressure is not perfect or the weather is cold then the speed can drop a lot.

soulman

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Reply #3

I was going to combine it with a 200 litre water butt for storage.

Water pressure is good here but I could go for the 100gpd unit instead. I was thinking 3-5 litres per day RO top up for evaporation and, hopefully, minimal water changes. The tank comes with a large skimmer, phosphate and calcium reactors and I'm building an algae scrubber.

Does that all sound sensible? Stocking to start will be 2 small clowns, a tailspot wrasse, pink spot goby, royal gramma, coral beauty, banggai cardinal and red mandarin (already feeding on frozen but system has a container growing copapods).

The land shark

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Reply #4

I don't do water changes so 75 is ample for my needs and I have a 4x2 also. I do have mine connected outside next to my butt so I don't have to worry about tubs in the kitchen anymore and that keeps the missus happy. End of the day get what you can fit and afford. If its not a problem leaving it to fill your 200l butt for 2 days instead of 1 then I don't see a problem. If you think you are going to be in a situation where you will run out then get a bigger one.

Keep an eye on the goby, if its new sand they have a habit of starving as you see from the sunken belly you see on many. Also depending on what corals you keep the cardinals don't really like high flow which if youre going down the sps route might not be the best idea. Just things to think about ;

ajm83

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Reply #5

If its not a problem leaving it to fill your 200l butt for 2 days instead of 1 then I don't see a problem. If you think you are going to be in a situation where you will run out then get a bigger one.

True, if you can store it in bulk , the speed is a lot less important.
4x2x2 is about 100 gal.  Let's say 10 gal/week for water changes + (guessing) 1 gal/day for top off.  That's 17 gal a week. 200 litres is 44 gals, so should be enough to last at least a couple of weeks between fills  8D

Only thing is if you have a tank emergency and need to a big water change to dilute something away, but hopefully that never happens!

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soulman

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Reply #6

The tank has loads of live rock and a decent bed of sand, corals vary from a decent size leather, a fair bit of candy cane, a decent colony of Duncan and several others I've  forgotten the name of. Tank is well established and been stable for a long time so I'm  hoping to carry on from that point. Eventually, when I'm satisfied it's  stable again after the move I'll change things if I want a different look, I am happy to wait months, or longer, before doing this, I'm  also happy to keep stocking levels low for a good while.

Only thing needed is livestock and water  for topping up, some of the livestock has been in my 120 litre tank that was kickstarted with some live rock from the tank I'm  now going to buy, water parameters have been stable and good since setting the 120L up.

soulman

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Reply #7

What about tds meter, inline and which model?

The land shark

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Reply #8



Only thing is if you have a tank emergency and need to a big water change to dilute something away, but hopefully that never happens!

This is why its a good idea to have a second butt with salted ready mixed..... erm good advice I don't actually do  :lol:

soulman

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Reply #9

The ro filter will be outside the kitchen window in a box on the wall, the water butt will be next to it, I already have a capped feed in the correct place.

Will the kitchen tap be usable when I'm  filtering water? Not a big deal as the house is empty most of the day so it can be left running if need be for a few hours each day during the week.

The land shark

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Reply #10

The ro filter will be outside the kitchen window in a box on the wall, the water butt will be next to it, I already have a capped feed in the correct place.

Will the kitchen tap be usable when I'm  filtering water? Not a big deal as the house is empty most of the day so it can be left running if need be for a few hours each day during the week.

Yes you will be able to use the tap. I used to have mine under the sink to my missus amusement

For years I used the handheld type. tds

But this will do the job, take note of the accuracy. I always change filters at 4 personally

HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy: Amazon.co.uk: Business, Industry & Science

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soulman

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Reply #11

Yes you will be able to use the tap. I used to have mine under the sink to my missus amusement

For years I used the handheld type. tds

But this will do the job, take note of the accuracy. I always change filters at 4 personally

HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy: Amazon.co.uk: Business, Industry & Science

That's the meter I'd seen, whole setup is around £90 including water butt, if I have to fill the tank using bought seawater it'll  be around £120 so the rodi setup plus a bucket of salt will be similar to having 400 litres delivered, and of course it's free topups  and just the cost of salt for a while.

The land shark

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Reply #12

Don't worry mate there will be plenty of other things to spend your money on. This hobby is like a drug addiction ;)
Last Edit: May 11, 2018 9:16:13 pm by The land shark

soulman

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Reply #13

I decided to buy one of the finer filters ro/di units and the tds meter, arrived yesterday and I plumbed it in outside today. The meter is reading 46 in and 0 out so assuming the meter is accurate that should be good enough? Flow is around 8 litres per hour and a similar amount in waste water, the butt should fill in a day so should have enough to fill the new tank in a couple of days.


The 4x2x2 has around 110kg of rock in the main tank and 30kg in the sump plus 2 magic mud bricks (?), my guesstimate is 320 litres water for the main tank and 150 litres for the 2 part sump (front houses skimmer, calcium reactor and phosphate reactor, second part is rock, magic mud and algae scrubber).


The plan is to collect tank stand and sump, set them up and fill with 450 litres, add salt and turn on powerheads and pump and heaters. 2 days after I'll collect the live rock, magic mud, algae reactor and corals and add them to the tank along with a bottle of Colony. Next morning check parameters and move fish and cleanup crew from the small tank I'm currently using. Does this sound like a good plan, the rock and coral should only be in a barrel for a hour or two maximum.
Last Edit: May 14, 2018 4:25:43 pm by soulman

The land shark

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Reply #14

110 kg of rock? you planning on getting water in there?  ;)

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