apart

all


the


way


around

the


top.



You


then


add

one

final


layer


of


timbers


over


the


plastic


to


give


it

extra
security.


This


final


layer


will


also


act


as

an

overflow

preventer


if

the


tank


is


exposed


to


rain

etc.
A
more


elaborate

method,


though

longer


lasting


is


pouring


a

concrete


pad

and

building


the


walls


using
concrete

blocks.



Once


completed,


the


tank


will


have

to


be

flushed


thoroughly

and

painted


with


a

non-

toxic
swimming

pool


paint


to


seal


it.
Tanks

can

also


be

built


using


thick

plywood

and

2X4


framing.



All


areas


where


the


plywood

intersects


should
be
sealed


with


a

generous

application


of


silicone


sealant


and

the


entire


interior

of


the


plywood

tank


should


be
painted

with


a

non-

toxic

swimming


pool


paint


to


prevent


rot.



A

list


of


construction


methods


could


go

on
forever
as

you

are


only


limited


by

your


imagination.
Miscellaneous

Equipment

Items
Grow

Bed


Medium
Your
choice


of


a

growing


medium

will


depend


on

what


plants

you

intend


growing


and

the


type


of


system

you
have
set


up.


You


should


choose


carefully


and

always

make


sure


your


grow

bed

medium

has

never


come


into
contact

with


herbicides,


insecticides,


petroleum


or


any

chemicals


of


any

kind.
One

medium

that


is


a

good


choice


is


washed


river


gravel


which

is


nice


with


its

well


rounded

edges


that


are
easy
on

both


hands


and

plant


stems.



Get


it

at


a

size


of


about


1/3


inch


to


3/4


inch


in


diameter.


Pea


gravel


is
another

good


choice,


but


don't


forget

that


gravel


that


is


too


small


in


diameter


can

clog


very


easily

and

will
retard
or


halt


water


movement


all


together.



Coconut


husk

is


also


great


in


that


it

is


also


bio

-

degradable


when
changed

out.



It

is


also


possible

that


you

will


not


be

using


a

growing


medium

as

in


a

free


flow


system.
Regardless
of


what


type


of


medium

you

use,


always

make


sure


to


rinse

it

thoroughly

before


placing

it

into

your
grow
beds.



Most


stone


and

gravels


and

even

coconut


husks

contain


dust


and

sand

and

other


small


particles
that

could


cause

you

a

problem

down


the


road.
AERATION
In

addition


to


the


aeration

provided


by

the


bio

-

filter,


additional


aeration

of


the


water


must


also


be

provide


in
some

manner


to


assist

in


removal

of


harmful


gases

which

build

up

in


the


water


during


the


filtration


process.


This

can

be

accomplished

in


a

number


of


ways


according


to


the


volume


of


water


involved.


BIO
-

FILTRATION
A
bio

-

filter


converts


harmful


ammonia

to


non-

toxic

Nitrate


and

can

also


aerate


the


water


assisting


in


the
removal
of


harmful


gases

from

the


water.



Bio

-

filters


utilize

two

types


of


bacteria,


Nitrosomonas

and
Nitrobacter

to


rid

the


water


of


the


nitrogen

produced

by

the


fish

and

broken

down


waste.


The


Nitrosomonas
bacteria
converts


the


ammonia

(NH3

-

N)

in


the


water


to


nitrite


(N02-

N)

and

the


Nitrobacter


bacteria

then
converts

the


nitrites


to


nitrates


(N03-

N)

which

are


not


toxic

to


the


fish.



Nitrates


are


a

very


high


quality


nitrogen
source

which

is


where


the


plants

come


into

play


in


an

aquaponics

system

by

removing

the


Nitrate


from

the
water

and

then


the


cleaned


water


is


returned


to


the


fish

to


complete

the


cycle.


It

is


essential


to


monitor


the
ammonia
and

nitrite


levels

in


your


system

on

a

regular

basis.
An

established

bio

-

filter,


working


efficiently,


also


produces

several


acids;


carbonic,

nitrous,


and

nitric

acids


as