Water change

[DUCADOS]

Just check with the expert here. If I need top up water every alternate day due to evaporation,is water change still a must?

I always top up around 40% of freshwater into my 3feet sump.

[tian1974]

since i dun do water change, i also topup with filtered water but i check my salinity and keep within the range of 1.024-1.026.

edit: i dun topup 40% so much btw, hahaha

[TayHongSiang]

Just check with the expert here. If I need top up water every alternate day due to evaporation,is water change still a must?

I always top up around 40% of freshwater into my 3feet sump.

yes....top up water is to bring the salinity level back to normal as a result of evaporation.

water change is to reduce nutrients and replenish vital trace elements

[jackywongto]

Just check with the expert here. If I need top up water every alternate day due to evaporation,is water change still a must?

I always top up around 40% of freshwater into my 3feet sump.

top up 40% of sump water every alternate day??? wow

that is a lot.

[teebs]

Just check with the expert here. If I need top up water every alternate day due to evaporation,is water change still a must?

I always top up around 40% of freshwater into my 3feet sump.

Water change and freshwater top up are two different things. Both have to be done. By the way, what do you mean by top up 40% of freshwater?

[DUCADOS]

40% of sump water not 40% of sump tank. Dun get me wrong n hope didn't scared the bro here who tot that it was 40% of tank water...

All along I tot that topping up of freshwater is as good as changing water coz both required new water...

[teebs]

40% of sump water not 40% of sump tank. Dun get me wrong n hope didn't scared the bro here who tot that it was 40% of tank water...

All along I tot that topping up of freshwater is as good as changing water coz both required new water...

Dun really understand what you are saying.

U mean u top up 40% of your sump water with freshwater?

[xaine]

40% of sump water not 40% of sump tank. Dun get me wrong n hope didn't scared the bro here who tot that it was 40% of tank water...

All along I tot that topping up of freshwater is as good as changing water coz both required new water...

If that 40% is due to evaporation, then freshwater would be fine but I find that amount excessive.

However, as Peter has mentioned, you will need to reduce excess nutrients from the water and putting back trace elements (from your saltwater mixture). So a water change would still be necessary to keep the tank running in good order (unless you are certain that tank conditions are excellent and you dose trace elements)

[raydiative]

as long as you are topping up the same amount of water that has evaporated from your tank it should not be any issue. You have to ensure that even after topping up your fresh water, you salinity is still relatively the same.

[LaW]

topping up water is NOT changing water.

sooner or later by doing that, ur salinity will be lower. and elements are not replenish. and i meant elements that are not measurable and you are not diluting whats bad in the water.

[DUCADOS]

I C wat bro LAW mean Liao. Changing will required discharging of old water then replenished new right?

[teebs]

Changing water means siphoning away your current tank water and replacing it with new NSW or salt mix.

Topping up means water level drops due to evaporation and you add distilled or DI water to make up for the water lost through evaporation.

I do have 1 question, how do you get 40% water loss in your sump tank through evaporation?

[jackywongto]

I C wat bro LAW mean Liao. Changing will required discharging of old water then replenished new right?

yup you got it!

[DUCADOS]

Changing water means siphoning away your current tank water and replacing it with new NSW or salt mix.

Topping up means water level drops due to evaporation and you add distilled or DI water to make up for the water lost through evaporation.

I do have 1 question, how do you get 40% water loss in your sump tank through evaporation?

No la not exactly 40% la. Just an estimate coz roughly can tell. Lost by half is 50% ma so slightly lesser than half will be 40% lo if not mean lagi less which is 30% probably.

[teebs]

No la not exactly 40% la. Just an estimate coz roughly can tell. Lost by half is 50% ma so slightly lesser than half will be 40% lo if not mean lagi less which is 30% probably.

So that is over a week or every alternate day? I only top up ard 6-10L a week for my 322 tank.

[xaine]

For a 3ft sump, that's alot of water even for 30%, unless you haven't topped up for a long duration.

In that case, your tank's SG would have increased by quite a bit.

[DUCADOS]

So that is over a week or every alternate day? I only top up ard 6-10L a week for my 322 tank.

Nope. Not a week. It's once every 2 days. I on my lighting quite long hour ba I think.

[LaW]

I C wat bro LAW mean Liao. Changing will required discharging of old water then replenished new right?

yeah you are right already.

just think it this way, top-up water ==> maintaing water level and salinit.

changing water: ==> diluting waste and replenishing whats good.

[[V]tEc]

r u running a chiller? or is ur tank leaking somewhere? to lose water that much in 2 days is nightmare for ur tank. i cant think how much ur perimeters of ur water will swing....

[DUCADOS]

Thanks all the bros here for the info...

[DUCADOS]

tEc' date='22 April 2010 - 09:14 PM' timestamp='1271942063' post='902250']

r u running a chiller? or is ur tank leaking somewhere? to lose water that much in 2 days is nightmare for ur tank. i cant think how much ur perimeters of ur water will swing....

Nope. No chiller no leaking. My house quite warm. Lighting lagi hot!

[teebs]

Nope. No chiller no leaking. My house quite warm. Lighting lagi hot!

What is the size of your tank and sump? I'm very sure that even without a chiller, there couldn't be that much evaporation from your sump.

[DUCADOS]

Tank 4x2x2.5

sump 3 feet

[teebs]

Tank 4x2x2.5

sump 3 feet

Do you have a fan blowing at your sump or at your tank? Otherwise I really don't think that you can have 40% evaporation rate in our sump.

[DUCADOS]

Ya... A fan blowing at the surface of water of my tank to maintain temperature of around 28 degree celcius.