Harry Potter: The Dragon Lord Comes to Hogwarts

"That... please wait a moment!"

Dudley spoke.

......

Allie turned her head suspiciously... Dudley turned around and took out an item from his backpack.

This item has a strange shape...

The bottom is a mesh structure.

There is a plastic tube at the top...

At its edge, there are some small holes for ventilation.

See this strange contraption.

Both Ron and Ellie looked at Dudley suspiciously...

Dudley explained casually:

"Sister...

Didn't you tell me before...

Seeing so many black scale fish thrown into the trash can every day...

And... feel a little sad?

Before I came to Hogwarts...

Saw it in a magazine!

The living space of the black scalefish...

There are certain requirements for "water quality"!

They...have a high oxygen demand for the water in the pool.

And this filter in my hand...

You place it at the outlet of the tank!

Then......

Put the other end in a bigger pool...

This way the water will flow through each other...

To increase the contact surface between water and air...

Also increases...dissolved oxygen and increases the oxygen content of the water..."

Speaking of which, Dudley looked at the doubts on Senior Ellie's face...

Can't help but sigh...

Sure enough... Is it too abrupt to explain "these" to a little wizard who is one or two years older than me?

......

After thinking about it, Dudley said directly:

"Anyway...

Ellie-senpai...

As long as you put this water pipe at the water inlet and outlet of the tank...

Even if the black scale fish does not cast a spell to clean the fish tank the next day...

They can still survive! "

......

"Really?"

Ai Li stared at her big round eyes, and her pupils were full of disbelief...

"Dudley...

I also feel that this little thing...

should......

Shouldn't have that 'strong' effect...

This kind of problem should be in Hufflepuff for a long time...

but......

Still can't solve it well...

I think... there must be 'details' that we don't know about.....

Otherwise...even if it can be solved, it's not up to our little wizards in the first grade to deal with it! "

Ron expressed doubts in his mouth.

Although......

He is not a foodie!

Usually... I don't have many chances to eat seafood...

But... this does not prevent him from imagining what a first-year wizard should be able to do.

to be honest!

If...a little first-year wizard could solve Hufflepuff House...

A problem that hasn't been solved for a long time...it's just...it's incredible!

Ellie on the side smiled and nodded!

Her eyes curled up quietly...

Then... looked at the little wizard beside him.

"Well... I think you're right, and what's your name?"

Allie asked.

Ron quickly replied:

"Senior, hello...

My name is Ron Weasley, you can just call me Ron! "

Ron scratched his red hair in embarrassment...

For the appearance of the beautiful big sister...

He always felt that he had no resistance.

although......

It's not enough to say that I like each other...

but......

He acted on the instinct of a little gentleman!

I also want to leave a polite impression on the other party...

Dudley, who was caught between the two, was very helpless...

After all, in theory...

The Ellie-senpai in front of me and Ron are both eleven or twelve-year-old children.

Myself... It should not be so easy to explain the structure and principle of the filter to them...

Besides...

The composition of the filter is obvious.

Most of the aquarium filtration system is mainly composed of upper filter...drip flow...bottom filter...filter bucket...side filter...back filter filter......

These filtration systems consist of...

in addition......

Explain to these two little kids again, make the water flow to increase the contact surface between water and air...

Increase dissolved oxygen to increase oxygen content in water.....

This kind of logic involving oxygen level is too abrupt.

think about it...

Dudley had no choice but to hand back the small filter device in his hand to Ellie and said seriously:

"Senior Ellie...

Is it...

Did you forget the agreement you made with me when I went to the back kitchen two days ago? "

Hearing Dudley's question, Ellie's face turned up, revealing a puzzled expression...

Fist at the end...

Hitting on the other white and tender palm.

"Oh~"

"I remembered...

yes... there is such a thing...

You said at the beginning, if you can help me solve this problem, then I promise you can 'eat' aquatic fish every day...

but......

Dudley, I also thought I was joking with you...

It's okay if you can't solve it...

wait a while....

These aquatic fish will be sent again by the surrounding food suppliers..."

Ally put her hands together on her knees...

Head down, looking at Dudley 1 in front of him

Show a kind smile:

"alright......

Dudley, I accept your wish...

in addition......

I'm going to class now...

You know Professor McGonagall has a very bad temper!

If only... let her know I've been chattering too long at the door.

Maybe she's going to punish us for copying the 'Transformation Lesson' spell exercises...."

After saying that, Ellie stretched out her hand and planned to put Dudley's filter device into her back pocket.

However, Dudley thought for a while and said:

"Eri-senpai, wait first~"

Ally paused in her footsteps and looked at Dudley suspiciously...

I don't know what else is going on with this little boy.

Her personality has always been gentle. If it wasn't because she was afraid of Professor McGonagall's sternness, she would really like to explain food creations to this white and clean little boy in front of her...

.....

ps: It’s updated, I wish you all good grades at the end of the term~ The author continues to work hard on coding