new setup, water change, will it work?

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Hi, planning a marine tank with easy water change, the tank is near mains water and waste so i was going to have a R.O filter filling a tank then have another tank i can make a salt mix in (agitator & heater) then pump that directly into the main tank for my water changes.  the main tank has an waste overflow higher than the sump return so as new water goes in it raises the level and overflows down waste. 
If i put a float valve on the sump tank 'in pipe' it would regulate the level in the sump & allow the main tank to 'overfill' down the waste overflow allowing sump and waterchange to both run at the same time, so once my salt mix tank is upto temp & mixed all i have to do is switch the pump on and let it run till empty
(excuse my crude paint sketch)
 
thats the idea, have a missed anything or is that sound in principle?

mightyhatter

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Reply #1

Are you planning on an RO ATO too? If the top up is only ever salt water your salinity will just keep rising

smifs_reef

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Reply #2

Yeh, be careful with that I am currently
Slowly trying to drop my salinity back down as it was low so filled the top up with salt water to slowly rise it and it shot up to nearly 1029. Which really pissed some sps corals off and all my lps


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adhdan

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Reply #3

sorry forgot to mention yes, i will have ATO running from clean R.O water, it will be my first marine tank, i always found the thought of frequent changes and tests daunting so i want to get it setup & simplified as much as possible before i even look at fish & corals

smifs_reef

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Reply #4

One thing u might find with your set up to add and take away the new water and taking away the old is u may have to have some form of solenoid valve to stop the siphon or back siphon from either the flow or return pipe. Once you have added enough water back in and turn the pump back off. If there’s no air break or a valve to isolate it, it would most likely siphon back to where it came from


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adhdan

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Reply #5

the down pipe to the sump from the tank is below the waterline a little to make it quiet & has a float valve at the bottom in the sump keeping the sump level at certain height and the pipe from the return pump has 1 way check valve, so that should self regulate to the pump speed or stop completely when the pump stops, when i do water change its just pumped into the tank and the overflow runs the excess down the drain

ajm83

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Reply #6

Are you saying the float valve in the sump will choke the main drain between the display and the sump to ensure the display gets the extra water and not the sump? I.e. the level raising in the sump,  closes the drain line off?

I think it will work but might be a bit of a flood risk relying on those float and return valves.   The problem is they get clogged with salt creep and spirorbid worms etc and then they don't completely close.

If you've got access to mains water and a drain, then you could use a Python No Spill to send the waste straight down the drain, using the water pressure from the tap.


Another solution is the Reefloat AWC,  which also acts as a mixing station for your saltwater.
If ReefBase has helped you, please consider making a donation to keep the site running

smifs_reef

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Reply #7

Yeh they’re really handy some of them mixing stations. How big is the tank? Is it a real back breaker to do a 10% water change? The old fashion tipping or in method? Lol


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