Water evaporation

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I just started a new system. Running now for 2 weeks without any problems. The system is running on 77 litres of water (47 litres in my tanks and 30 litres in my sump). I have built my most of my own equipment - skimmer, trickle filter and algae skimmer. My water evapuration is now 5 to 7 litres per week. I top up with with RO or salt water depends on the sg. Do I still need to do water changes and if so how many percent?

Is it nescessary to look into sand ebd filter?
 

Kanga

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A warm welcome to MASA freek

Yes it is still important to do water changes, first off your salinity should not be affected by the evaporation.
Secondly the nitrates, phosphates etc don't evaporate with the water so they will just keep on getting more concentrated.
With a tank that size regular water changes are absolutely essential.
 

Tobes

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Welcome to MASA. Always top up evapourated water with RO, you need to replace the lost water to keep the salinity perfect. The salinity shouldn't change unless you take out water and refill with lower or higher salinity water - which is not advisable. A 10% water change every week is good. Just remember to "age" your newly mixed salt water for at least 24hours before using it. Always add salt to water and not water to salt. Get the water temp right before adding salt - helps for the salt to dissolve better. Let it circulate in a bucket with a heater and powerhead until needed.
Always good to have salt water ready in case of an emergency ;)
 
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hello there freek:)

welcome to masa great to have you here.

that tank sounds like a nice one to start with, any chance of a pic?

tobes explained the evaporation thing well, do you have an RO unit at home for top up or do you buy from a LFS? If you buy then try check the total disolved solids first if you have a TDS meter:)
 

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