Just moved and new IG pool deck has holes ?

[TFP_wanna_be]

New house and new pool fun. Never had a sand filter so I plan to read up on that...
Question: what are the holes in the deck that have a slight suction and are inline with the wall jets?

Today was my introduction to the pool.
Has a Hayward gas heater H250
Hayward sand filter S220T
1.25HP motor

The pictures are of the entire pool. And zoomed in on a hole in the deck that makes a sucking sound and has a little suction power - never seen this before....


Any thoughts?
Thank you

 

[MarianParoo]

Pretty pool and gorgeous view! I can't help with the sucking holes.....

Do you know how to make that water sparkle?

 

[TFP_wanna_be]

Thank you! I'm heading back over to test and get the basics started... I fell in love with my current DE filter and how well it works, but I'm reading sand filters can do a great job too..!! Yes, I want that water to expose the white diamond brite and see the bottom drain. I don't even know how deep it is ;-) at the moment, the pressure gauge reads zero and that's all I know... I never wanted two pools, but until the other house sells, I'll be over both systems...

I'm finding some info that it may be a Hayward Venturi system that pulls air into the wall get and increases the movement of the water... Not 100% sure, but that is the initial thought... It's the wet sucking sounds that have me wondering.

 

[TFP_wanna_be]

Ditched sandy the sand filter and went with a DE filter, cleared a declining swamp in 3 days... Just amazing!!!

 

[MarianParoo]

Excellent!