<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-03-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001107809</issuerCik>
        <issuerName>HYDROFLO INC</issuerName>
        <issuerTradingSymbol>SLRW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001456907</rptOwnerCik>
            <rptOwnerName>James JayCee</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>9298 SVL BOX</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>VICTORVILLE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92395</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Majority Holder</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Preferred</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2009-04-08</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2009-04-08</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>12000000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12000000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common</value>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </securityTitle>
            <transactionDate>
                <value>2009-04-08</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2009-04-08</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>14000000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14000000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Establishment of the Solarbrook Water &amp; Power Corp.discriminatory share price, the reporting owner has determined to issue as previously filed in the SEC Form 3, 12,000,000 shares preferred stock upon the completion of Solarbrook Water &amp; Power Corp. (SLRW) corporate restructuring notwithstanding all like industry comparable share structures and share prices.</footnote>
        <footnote id="F2">Establishment of the Solarbrook Water &amp; Power Corp.discriminatory share price, the reporting owner has determined to issue as previously filed in the SEC Form 3, 14,000,000 shares common stock upon the completion of Solarbrook Water &amp; Power Corp. (SLRW) corporate restructuring notwithstanding all like industry comparable share structures and share prices</footnote>
    </footnotes>

    <remarks>All Common shares and Preferred shares if applicable currently outstanding on OTC market Tier Pink Sheets under Ticker Symbol SLRW As of Nov 16, 2007 notwithstanding Form 3 filed March 12, 2009 and subsequently Form 3A filed April 9, 2009 shall be transferred to majority holder and ownership listed with all Market Makers and Transfer Agents including proper book entry as permitted in the most current filing. As used herein, the term own includes legal ownership, but in all cases includes beneficial ownership more than 50% of whose equity interests are beneficially owned.
According to Corporate Filings for file number 0517159 and SEC filing 3 filed 3/12/2009 and subsequently SEC Form 3/A filed on 4/9/2009, Control is deemed to exist as permitted under 13d-4 of SEC 34 I expressly declare that the current filing shall be construed as an admission that such person is for the purposes of Sections 13(d) or 13(g) the beneficial owner of any securities covered by the filings defined for these purposes.</remarks>

    <ownerSignature>
        <signatureName>JayCee James</signatureName>
        <signatureDate>2009-04-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
