Drain issues?

[2014construction]

Hello
Had new drains installed last year.

Any ideas what may be causing this green 'stuff' as it gets like this when not raining.

Thank you all for your help

 

[kazuya]

lack of sunlight?

 

[2014construction]

It did cross my mind but i just thought could it been a issue with the new renewed drains you see.

 

[Newboy]

Look more like a leak from the connector - what is the white pipe connected too?

 

[2014construction]

The while soilpipe is connected to the drains directly.

 

[theprinceofdarkness]

Looks like its leaking.
frank

 

[Newboy]

The while soilpipe is connected to the drains directly.

I guessed that bit - what's it connected to above ground?

 

[r896neo]

what are the falls like on the concrete, i assume rainwater doesnt pool in either of these areas?

Sometimes a repair to concrete drives will just take alage and moss growth much differently to the rest.

If the areas in question are well sloped to shed water then something appears to be leaking.