<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>3</documentType><periodOfReport>2003-05-14</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001107809</issuerCik>
        <issuerName>HYDROFLO INC</issuerName>
        <issuerTradingSymbol>HYRF</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001207031</rptOwnerCik>
            <rptOwnerName>BARBEE THOMAS F</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>1</isTenPercentOwner><isOther>0</isOther><officerTitle>President</officerTitle></reportingOwnerRelationship></reportingOwner><derivativeSecurity><securityTitle><value>Option</value></securityTitle><conversionOrExercisePrice><value>0.22</value></conversionOrExercisePrice><exerciseDate><value>2001-08-01</value></exerciseDate><expirationDate><value>2006-07-31</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Option</value></underlyingSecurityTitle><underlyingSecurityShares><value>675000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeSecurity><derivativeSecurity><securityTitle><value>Option</value></securityTitle><conversionOrExercisePrice><value>0.22</value></conversionOrExercisePrice><exerciseDate><value>2002-08-01</value></exerciseDate><expirationDate><value>2007-07-31</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Option</value></underlyingSecurityTitle><underlyingSecurityShares><value>675000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeSecurity><ownerSignature><signatureName>Thomas F. Barbee</signatureName><signatureDate>2003-06-10</signatureDate></ownerSignature></ownershipDocument>

